Matthew 5:27 is Jesus quoting the commandment against adultery that his listeners already knew, and then pointing out that the command reaches further than the act itself. It is a teaching about the heart as well as the hands. Jesus spoke it during the Sermon on the Mount, a long address to his disciples and the crowds gathered on a hillside in Galilee.
“You have heard that it was said, ‘You shall not commit adultery;’
Matthew 5:27 (WEB)
What Matthew 5:27 Means
The verse opens with “You have heard that it was said.” Jesus is referring to what the Law of Moses taught, which people had heard read aloud in the synagogue for generations. The phrase “You shall not commit adultery” is one of the Ten Commandments, and Jesus treats it as God’s own word. He is not setting it aside. He is about to deepen it.
What the verse does not do is reject the commandment or suggest that the outward act is unimportant. Jesus builds on the law. The sentence that follows in verse 28 shows where he is headed: the concern is what a person allows to take root inside them before any physical act takes place. The verse sets up the contrast he is about to draw, so it works best when read alongside what comes next.
The Context of Matthew 5:27
Matthew, a former tax collector who became one of Jesus’ twelve apostles, wrote this Gospel for a community that knew Jewish law well and wanted to see how Jesus fulfilled it. The Sermon on the Mount, of which this verse is part, is presented as Jesus’ teaching on how life in God’s kingdom looks. The audience is his disciples, with the crowds listening in.
The verses just before, 24 through 26, deal with reconciliation: making peace with a brother before bringing a gift to the altar, and settling disputes before they reach a judge. Verses 29 and 30, just after, use vivid language about plucking out an eye or cutting off a hand. Read in that setting, verse 27 belongs to a single thread about taking sin seriously at its source, in relationships and in desire, before it grows into something that destroys.
Key Phrases in Matthew 5:27
Proverbs 4:23
Keep your heart with all diligence, for out of it is the wellspring of life.
(WEB)
This proverb urges you to guard your heart above all else, because the springs of life flow from it. It reinforces the idea in Matthew 5:27 that inner attitudes shape outward conduct, and that protecting the heart is the wiser course.
Psalm 51:10
Create in me a clean heart, O God. Renew a right spirit within me.
(WEB)
David’s prayer after his sin with Bathsheba asks God to create a clean heart within him. It shows that Jesus’ call to purity of heart is answered not by willpower alone but by God’s renewing work, which the psalmist asks for directly.
A Short Prayer From Matthew 5:27
Lord, you see what I think about when no one else is watching. I confess that my desires sometimes wander toward things that would harm the people I love and wound my own soul. Search my heart and show me where I have allowed something to take root that does not belong. Give me the courage to turn from it early, and the grace to be faithful in what I do and what I imagine. Make me clean within, so that my life reflects your love. Amen.