Mark 10:1-12 CSB
He set out from there and went to the region of Judea and across the Jordan. Then crowds converged on him again, and as was his custom he taught them again.
Some Pharisees came to test him, asking, “Is it lawful for a man to divorce his wife?”
He replied to them, “What did Moses command you?”
They said, “Moses permitted us to write divorce papers and send her away.”
But Jesus told them, “He wrote this command for you because of the hardness of your hearts. But from the beginning of creation God made them male and female. For this reason a man will leave his father and mother and the two will become one flesh. So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.”
When they were in the house again, the disciples questioned him about this matter. He said to them, “Whoever divorces his wife and marries another commits adultery against her. Also, if she divorces her husband and marries another, she commits adultery.”
CSB: Christian Standard Bible