You have heard that it was said to the first ones: «Do not commit adultery».
In this saying, Jesus again turns to the commandments of the Old Testament, specifically pointing to the commandment, “Do not commit adultery,” which is given among the Ten Commandments (Exodus 20:14, Deut. 5:18). This commandment is directed toward preserving the family and marital faithfulness, as well as sexual self-control.