Muwatta Malik #1296

Yahya related to me from Malik from Hisham ibn Urwa that his father said, "It used to be that a man would divorce his wife and then return to her before her idda was over, and that was alright, even if he divorced her a thousand times. The man went to his wife and then divorced her and when the end of her idda was in sight, he took her back and then divorced her and said, 'No! By Allah, I will not go to you and you will never be able to marry again.' Allah, the Blessed, the Exalted, sent down, 'Divorce is twice, then honourable retention or setting free kindly.' People then turned towards divorce in a new light from that day whether or not they were divorced or not divorced."