Sahih al-Bukhari 1775, 1776

Qutaybah narrated to us: Jarir narrated to us, from Mansur, from Mujahid, who said: Urwah ibn al-Zubayr and I entered the mosque and saw Abdullah ibn Umar, may Allah be pleased with them both, sitting beside Aisha room. We also saw people praying the forenoon prayer in the mosque. We asked him about their prayer, and he said: It is an innovation. Then he asked him: How many times did the Messenger of Allah, peace and blessings be upon him, perform Umrah? He said: Four, one of them in Rajab. We were reluctant to contradict him. He said: We heard Aisha, Mother of the Believers, cleaning her teeth in the room. Urwah said: Mother, Mother of the Believers, do you hear what Abu Abd al-Rahman is saying? She said: What is he saying? He said: He says the Messenger of Allah, peace and blessings be upon him, performed four Umrahs, one of them in Rajab. She said: May Allah have mercy on Abu Abd al-Rahman. He never performed an Umrah without my being present with him, and he never performed one in Rajab at all.