It was also said [Deut. 24:1-3], ‘Whoever divorces his wife, let it be done with a [legally binding] divorce decree, which he must give her.’
Some Pharisees came to Him, [attempting] to put Him to a test. They said, “Is it permissible by the Law of Moses for a man to divorce his wife for any reason [he chooses]?”
They replied, “Why then did Moses order [a man] to provide a legal divorce decree [Deut. 24:1], and then divorce his wife?”