Matthew 5:27
You have knowledge that it was said, You may not have connection with another man's wife:
Exodus 20:14
Do not be false to the married relation.
Deuteronomy 5:18
Do not be false to the married relation.
Leviticus 20:10
And if a man has sex relations with another man's wife, even the wife of his neighbour, he and she are certainly to be put to death.
Deuteronomy 22:22-24
If a man is taken in the act of going in to a married woman, the two of them, the man as well as the woman, are to be put to death: so you are to put away the evil from Israel.
Proverbs 6:32
He who takes another man's wife is without all sense: he who does it is the cause of destruction to his soul.
Matthew 5:21
You have knowledge that it was said in old times, You may not put to death; and, Whoever puts to death will be in danger of being judged: