Mark 10:4

‘And they said, “Moses allowed the giving of a Certificate of Divorce and to put her away.”

Their minds automatically concentrated on Deuteronomy 24:1, for that was the only place in the Law where divorce was mentioned. In that verse God, through Moses, had made provision for the protection of women who were turned out of the houses by their husbands. The decree was that they could not just be turned away, but had to be given an official Certificate of Divorce so that it was clear to all that they were seen as free to be able to marry again. But to the Scribes this had become Moses' official ruling, and was therefore seen as revealing the will of God. (It was seen as their responsibility to apply the Law to every situation, so that as this was the only passage that dealt with the subject it had become the basis of their positions).