Luke 16:18

16:18 “Everyone who divorces his wife and marries ¹  someone else commits adultery, and the one who marries a woman divorced from her husband commits adultery.

Luke 18:20

18:20 You know the commandments: ‘Do not commit adultery, do not murder, do not steal, do not give false testimony, honor your father and mother.’” ² 

[16:18]  ¹ sn The examples of marriage and divorce show that the ethical standards of the new era are still faithful to promises made in the presence of God. To contribute to the breakup of a marriage, which involved a vow before God, is to commit adultery. This works whether one gets a divorce or marries a person who is divorced, thus finalizing the breakup of the marriage. Jesus’ point concerns the need for fidelity and ethical integrity in the new era.

[18:20]  ² sn A quotation from Exod 20:12-16 and Deut 5:16-20. Jesus cited the parts of the ten commandments that relate to how others should be treated.