Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) narrates from Sayyiduna Umar (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) divorced Sayyidah Hafsah (may Allah be pleased with her) and then took her back.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 14892
Hamzah, son of Abdullah bin Umar (may Allah be pleased with them both), narrates from his father that he said: I had a wife whom I loved, and my father disliked her. My father said to me: "Divorce her." I refused. He came to the Messenger of Allah (peace and blessings be upon him) and mentioned it, and the Messenger of Allah (peace and blessings be upon him) said: "Divorce her." So I divorced her.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 14893