Musnad Ahmad 27:562

Yazid narrated to us, Ibn Abi Dhi'b informed us, from al-Harith ibn 'Abd al-Rahman, from Hamzah ibn 'Abd Allah ibn 'Umar, from his father, who said: I had a wife under me whom I loved, and 'Umar disliked her. He ordered me to divorce her, but I refused. So he came to the Prophet, peace and blessings of Allah be upon him, and said: "O Messenger of Allah, 'Abd Allah ibn 'Umar has a wife whom I dislike for him, and I ordered him to divorce her, but he refused." The Messenger of Allah, peace and blessings of Allah be upon him, said to me: "O 'Abd Allah, divorce your wife." So I divorced her.