Cross reference
Matthew 5:27
27 You have knowledge that it was said, You may not have connection with another man's wife:
Deuteronomy 5:18
18 Do not be false to the married relation.
Exodus 20:14
14 Do not be false to the married relation.
Deuteronomy 22:22-24
22 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.
23 If a young virgin has given her word to be married to a man, and another man meeting her in the town, has connection with her;
24 Then you are to take the two of them to the doorway of the town, and have them stoned to death; the young virgin, because she gave no cry for help, though it was in the town, and the man, because he has put shame on his neighbour's wife: so you are to put away evil from among you.
Matthew 5:21
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:
Leviticus 20:10
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.
Proverbs 6:32
32 He who takes another man's wife is without all sense: he who does it is the cause of destruction to his soul.