Moses
Deuteronomy 24:1BSB·traditional attribution

If a man marries a woman, but she becomes displeasing to him because he finds some indecency in her, he may write her a certificate of divorce, hand it to her, and send her away from his house.

John Calvin Reformed @genevareformer

Although what relates to divorce was granted in indulgence to the Jews, yet Christ pronounces that it was never in accordance with the Law, because it is directly repugnant to the first institution of God, from whence a perpetual and inviolable rule is to be sought.

Matthew Henry Presbyterian @wholebiblehenry

This is that permission which the Pharisees erroneously referred to as a precept, Mat 19:7, Moses commanded to give a writing of divorcement. It was not so; our Saviour told them that he only suffered it because of the hardness of their hearts, lest, if they had not had liberty to divorce their wives, they should have ruled them with rigour, and it may be...

Commenting on Deuteronomy 24:1-4

John Gill Reformed Baptist @doctorgill

When a man hath taken a wife and married her,.... That is, when a man has made choice of a woman for his wife, and has obtained her consent, and the consent of her parents; and has not only betrothed her, but taken her home, and consummated the marriage: and it come to pass that she find no favour in his eyes; is not agreeable...