Matthew
Chapter 19

When Jesus had finished this discourse, he left Galilee and came to the district of Judea across the Jordan. Great crowds followed him and he cured them there.

The Question of Divorce

Some Pharisees came up to him and said, to test him, "May a man divorce his wife for any reason whatever?" He replied, "Have you not read that at the beginning the Creator made them male and female and declared, 'For this reason a man shall leave his father and mother and cling to his wife, and the two shall become one flesh. Therefore, let no man separate what God has joined." They said to him, "Then why did Moses command divorce and the promulgation of a divorce decree?" "Because of your stubbornness Moses let you divorce your wives," he replied; "but at the beginning it was not that way. I now say to you, whoever divorces his wife and marries another commits adultery, and the man who marries a divorced woman commits adultery."
His disciples said to him, "If that is the case between man and wife, it is better not to marry." He said, "Not everyone can accept this teaching, only those to whom it is given to do so. Some men are incapable of sexual activity from birth; some have been deliberately made so; and some there are who have freely renounced sex for the sake of /god's reign. Let him accept this teaching who can."

Matthew 19
and

Mark
Chapter 10

From there he moved on to the districts of Judea and across the Jordan. Once more crowds gathered around him, and as usual he began to teach them.

The Question of Divorce

Then some Pharisees came up and as a test began to ask him whether it was permissible for a husband to divorce his wife. In reply he said, "What command did Moses give you?" They answered, "Moses permitted divorce and the writing of a decree of divorce." But Jesus told them: "He wrote that commandment for you because of your stubbornness. At the beginning of creation God made them male and female; for this reason a man shall leave his father and mother and the two shall become as one. They are no longer two but one flesh. Therefore let no man separate what God has joined." Back in the house again, the disciples began to question him about this. He told the, "Whoever divorces his wife and marries another commits adultery against her; and the woman who divorces her husband and marries another commits adultery."

Mark 10