They said, “Moses allowed a man to write a letter of divorce and send his wife away.”
They asked, “Then why did Moses say that a man could give his wife a letter of divorce and send her away?”
He thought that Mary hadn’t been faithful to him. He wanted to follow the law of Moses and didn't want to put her to shame in public. So he planned to break up with her quietly.
“What did Moses command you?” he replied.