Sayyiduna Umar (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) divorced Hafsa, then took her back.
Hadith Referenceسلسله احاديث صحيحه / الزواج ، والعدل بين الزوجات وتربية الاولاد والعدل بينهم وتحسين اسمائهم / 1542