You Shall Not Give False Testimony Against Your Neighbour

21 Sept

Exodus 20:16, Psalm 15

There's a scene in A Few Good Men where a military lawyer puts a Colonel on the stand and needles him until he cracks. The Colonel is so convinced of his own righteousness, so certain he's the one telling the hard truths, that his false witness comes wrapped in a genuine belief that he's defending order and justice. Which is what makes the famous line land so hard: "You can't handle the truth." He's not just deceiving the courtroom. He's deceiving himself.

We're all more self-deceived than we think.

There's also a card game called Mafia. The whole premise is deceit: lying to your friends, misdirecting suspicion, accusing other people to protect yourself. And what's unsettling about it isn't the game. It's how naturally it comes. Nobody has to be taught to lie in Mafia. You just do it. You think fast, read the room, and say what serves you best in the moment.

Watch a child with their hand in the cookie jar and you see the same thing. The lie arrives before the thought. We don't have to work hard at this.

What the Commandment Protects

Before we get to what the ninth commandment says, it's worth noting what comes just before it. Exodus 20:2: “I am the Lord your God, who brought you out of Egypt, out of the land of slavery.” Before a single command, God reminds Israel that he rescued them. Save first, command second. The commandments aren't a ladder to climb to earn his favour, they flow from who he already is, and who his people already are as a result.

And this matters for the ninth commandment specifically, because the God giving this command is described in Numbers 23:19 as one who has never once lied, never once failed to keep his word. He is not a human being, that he should lie. The commandment doesn't come from a God who has guidelines about honesty. It comes from the God who is truth.

Which means bearing false witness isn't just breaking a rule. It's working against reality itself.

Exodus 20:16: You shall not give false testimony against your neighbour. It doesn't say you shall not lie. It's courtroom language: the language of witnesses, testimony, verdicts. In ancient Israel, there were no security cameras, no forensic evidence, no voice recordings. When someone was accused, what decided their fate was the testimony of witnesses. God built protections into the law: one witness wasn't enough. Two or three were required. And if a witness was proved false, whatever they had intended to happen to the accused would happen to them instead.

The story of Naboth in 1 Kings 21 makes this concrete. Jezebel wanted Naboth's vineyard. She organised a feast, put him in the seat of honour, and hired two criminals to publicly accuse him of cursing God and the king. On their testimony, Naboth was stoned to death. And God's response was clear: Ahab and Jezebel would face the same fate. False witness was a grave injustice, treated as gravely as the crime it tried to cause.

More Than a Courtroom

But this commandment was never only about legal proceedings. Every time we talk about our neighbour, we are giving testimony that shapes the verdict others reach about them. Our neighbour carries God's image exactly as much as anyone standing trial in ancient Israel did. And so our words about them are never neutral.

Twisting someone's words misrepresents the evidence. Gossip is testimony in the court of public opinion. Reaching a verdict about someone before you've heard the full story is judging without a fair hearing. None of it happens under oath in a courtroom. But all of it is false witness.

The Heidelberg Catechism unpacks it helpfully: we must not twist someone's words, hold back truth, gossip, slander, or condemn anyone rashly or unheard. We can tell a technically true story and still completely mislead people, leave out the moment where we said something we shouldn't have, frame someone's reaction without mentioning what provoked it, tell the version where we're the reasonable one and they're impossible. We're not lying, exactly. We're curating.

Then there's the matter of our word more broadly. Jesus addresses it directly in Matthew 5: let your yes be yes and your no be no. Anything beyond this comes from the evil one. How often do we say yes to a commitment knowing we probably won't follow through? How often do we tell someone we love them and then walk into the next room and say something that contradicts it entirely?

And then there's double standards, holding everyone else to an account we exempt ourselves from. Rushing to a verdict. Ted Lasso has a line worth borrowing: the people who judged him were never curious. They never asked questions. Curiosity and judgment can't coexist. When we're genuinely curious about people, we represent them more honestly.

Not a Modern Problem

This isn't a modern problem. Jeremiah 17:9 puts it plainly: the heart is deceitful above all things, and beyond cure. Who can understand it?

The root goes all the way back to Genesis 3. Before Adam and Eve were deceived, Satan was lying. Did God really say? You will not surely die. God knows that when you eat from it your eyes will be opened.

The very first sin was a false witness against God's character, calling his word into question, casting doubt on his motives, suggesting the truth was being withheld. Jesus later describes Satan as a murderer from the beginning, not holding to the truth, because there is no truth in him. When he lies, he speaks his native language.

We've continued in captivity to those lies ever since. When we lie, we're not learning a new behaviour, we've inherited one of the oldest there is. We're acting against our own design, distorting the very order God built us for.

And we're so surrounded by lies that we can't even trust each other's word without enforcement. Contracts have to be signed and witnessed. Courts make you swear an oath because your word alone isn't enough. And when honesty is inconvenient, we find another way, often by deciding who counts as our neighbour. They're not one of us. I don't owe them the truth.

But Paul is clear in Romans 13: the commandments are summed up in love your neighbour as yourself. Denying someone the truth is a failure to love them. It's a denial of the truth and justice every person is owed, because every person is made in the image of the God of truth.

The Standard We Can't Reach

Psalm 15 holds up a picture of the person who can dwell near God. Not the most talented or the most successful, someone whose character reflects the God they belong to. Someone who speaks truth from their heart, whose tongue utters no slander, who keeps an oath even when it hurts, and does not change their mind.

In Hebrew, the word for truth — emet — and the word for faithfulness — emunah — come from the same root: aman, meaning something like firm, solid, reliable. It's also the root behind amen. When we finish a prayer with amen, we're saying this is true, this is reliable. For the Hebrew mind, truth and faithfulness weren't different things — they were the same. A true witness and a faithful witness were the same person. Truth isn't just about whether the facts are accurate in the moment. It's about whether you can be relied upon to uphold it.

That's a high standard. And the honest response to Psalm 15 isn't to feel reasonably good about our score. It's to recognise that none of us reach it. The psalm holds up a mirror. The person it describes is pointing us somewhere beyond ourselves.

The One Faithful Witness

In 1 Peter 2:22, we're told that Jesus committed no sin and no deceit was found in his mouth. He never bore false witness — not once, not even in the smallest way.

And yet in Matthew 26, when Jesus stood before the Sanhedrin, the chief priests were searching for false evidence to use against him. Many false witnesses came forward. It's the story of Naboth, but at a cosmic level, an innocent man condemned by fabricated testimony, put to death so that others could benefit.

But this story doesn't end there.

Standing before Pilate just hours before his crucifixion, Jesus says: the reason I was born and came into the world is to testify to the truth. Everyone on the side of truth listens to me. Pilate asks, "What is truth?" — missing the point entirely. Truth itself is standing right in front of him.

John 14:6: I am the way and the truth and the life. Revelation 3:14 calls him the Amen, the faithful and true witness, the ruler of God's creation.

In Revelation 12, we see the accuser hurling accusations against God's people day and night. Every sin, every failure, every inconsistency, every twisted story. Into that courtroom walks Jesus, the faithful witness, and he doesn't have to twist the truth or leave anything out. He says the truest thing that can ever be said about anyone who belongs to him: I know. And it's been paid for. Every accusation. Paid for in full.

And Jeremiah, centuries before Jesus, had already told us what that would mean. God promised a day when his truth wouldn't just be a command written on tablets, it would be written on hearts. “I will put my law in their minds and write it on their hearts. I will be their God, and they will be my people.”

Hebrews tells us that's exactly what Jesus's death and resurrection accomplished. We're not just told the truth. We're given a heart that can actually hold it. We're given the Spirit of truth. Being a faithful witnesses isn't based on how well we can imitate Jesus. It flows from his Spirit living in us.

There is a real difference between being told the truth and being made truthful.

What It Looks Like Now

So practically, most of us won't be in a courtroom any time soon. But it’s much close to home than that.

The opposite of bearing false witness is actively defending and promoting your neighbour's honour and reputation. It means guarding someone else's name before you guard your own story. It means speaking truth in love, not truth without love, which is a weapon, and not love without silence about the truth, which is flattery. It means letting your yes be yes, and when you can't do something, saying no rather than letting the truth come out later in a worse way.

It means being curious rather than quick to judge. Before rushing to a verdict about someone, ask why. What's the part of the story you haven't heard yet? When we're genuinely curious about people, we represent them more honestly.

And it means examining where we're tempted to be a false witness to God himself, editing him into a version that fits what we want, or what we think others want to hear. Representing him in a way that's shaped more by our agenda than by who he actually is.

Whatever we manage to hide for now, buried truth eventually resurfaces. And when it does, it rarely just embarrasses us, it costs us the very thing false witness was trying to protect: the trust someone has placed in us.

But the cure isn't trying harder. It's not gritting our teeth or being more vigilant about accuracy. It's remembering who we already are in Jesus: the one faithful and true witness, whose word has never once failed in the entire span of human history. As his people, with his Spirit living in us, we are freed to become faithful witnesses too.

Not from more effort. From who we already are in him.