See the notes at Matthew 5:32. These verses occur in Matthew in a different order, and it is not improbable that they were spoken by our Saviour at different times. The design, here, seems to be to reprove the Pharisees for not observing the law of Moses, notwithstanding their great pretensions to external righteousness, and to show them that they had “really” departed from the law.
Related Commentaries of Luke 16:18
Luke 16:18
18 Whosoever putteth away his wife, and marrieth another, committeth adultery: and whosoever marrieth her that is put away from her husband committeth adultery.