Deuteronomy 5:18
Neither shalt thou commit adultery.
Cross-reference
Exodus 20:14 is the parallel account of the same commandment against adultery in the Decalogue.
In Proverbs 6:32, the same sin is condemned, noting that adultery destroys the one who commits it.
Proverbs 6:33 continues the warning about adultery, describing the lasting disgrace that follows.
In Matthew 5:27, Jesus cites this commandment directly before expanding it to include lustful intent.
In Matthew 5:28, Jesus expands this command to include lustful looks, teaching that adultery begins in the heart.
In Luke 18:20, Jesus directly quotes this commandment to the rich young ruler as part of the standard moral law.
In James 2:11, this command is quoted alongside 'do not murder' to argue that breaking one law makes you a transgressor of the whole.
In Leviticus 18:20, a similar prohibition against adultery with a neighbor's wife reinforces the same moral standard.
In James 2:10, this command is part of the whole law; breaking one point makes one guilty of all, showing the law's unity.
In Jeremiah 5:8, the prophet uses vivid imagery to condemn Israel's adultery, echoing this command's prohibition.