Musnad Ahmad 27:264

Yahya narrated to us, from Ibn Abi Dhi'b, from his maternal uncle Al-Harith, from Hamzah ibn Abdullah ibn Umar, from his father, who said: I had a wife under me, and Umar disliked her. He said: "Divorce her," but I refused. So Umar came to the Messenger of Allah (peace and blessings of Allah be upon him) and he said: "Obey your father."