Matthew 5:27 is Jesus pointing back to a commandment everyone in His audience already knew, then showing that the command reaches deeper than outward behavior. Jesus is saying that adultery begins in the heart, long before any physical act. The verse opens the famous section of the Sermon on the Mount where Jesus contrasts what “was said” in the law with what He now says to His disciples and the crowds listening on the hillside.
“You have heard that it was said, ‘You shall not commit adultery;’
Matthew 5:27 (WEB)
What Matthew 5:27 Means
The phrase “You have heard that it was said” tells you that Jesus is quoting familiar teaching, most directly the seventh commandment from the Ten Commandments: do not commit adultery. Jesus does not dismiss that command. He is simply introducing the idea that He is going to look at it more closely, which He does in the verses that follow.
The verse itself is only the setup. It does not yet describe lust, looking, or the heart. It names the law as people had learned it, so that the reader can see what Jesus is about to add. It promises nothing new in itself. Its job is to set the stage for a deeper reading of obedience.
What the verse does not do is suggest that the commandment has been replaced or made easier. Jesus will go on to make the standard more demanding, not less. Reading Matthew 5:27 by itself can make it seem like a simple reminder, but its meaning opens up only when you follow the argument through.
The Context of Matthew 5:27
Matthew’s Gospel was written to a community that knew the Jewish Scriptures well and wanted to understand how Jesus fulfilled them. Matthew presents Jesus as the authoritative teacher who speaks with the weight of the law, and the Sermon on the Mount (chapters 5 to 7) is his most extended collection of Jesus’ teaching. Traditionally the author is identified as Matthew the tax collector, one of the twelve disciples.
The verses just before Matthew 5:27 deal with reconciliation and settling disputes, and the verses just after move straight into the warning about the right eye and the right hand causing you to stumble. Read in that setting, the verse is part of a sustained call to deal seriously with sin at its root. The surrounding material shows that Jesus is not interested in a religion that only guards appearances, so Matthew 5:27 reads as the start of a challenge to take inner honesty as seriously as outer conduct.
Key Phrases in Matthew 5:27
Psalm 51:10
Create in me a clean heart, O God. Renew a right spirit within me.
(WEB)
David’s prayer for a clean heart shows the same concern Jesus raises in Matthew 5:27: that God cares about the inner person and not only the outward act. Reading the two together reminds you that the desire for purity starts with asking God to change what is hidden within.
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 with all diligence, since your life flows from it. It parallels Jesus’ teaching that the heart is the true source of what defiles a person, and it shows that watchfulness over inner desires is an ancient and practical wisdom.
A Short Prayer From Matthew 5:27
Lord, you see what I try to hide, including the thoughts I tell myself do not matter. Search my heart and show me where I have let my desires wander away from you. Give me the courage to turn away from what feeds temptation and the wisdom to bring my struggles into the light with people you have placed around me. Help me to honor the faithfulness you ask of me, and let my inner life become a place where your truth is welcome. Amen.
