Sunan Ibn Majah 2979

Abū Bakr ibn Abī Shaybah and Muḥammad ibn Bashshār narrated to us; they said: Muḥammad ibn Jaʿfar narrated to us. [A second chain:] Naṣr ibn ʿAlī al-Jahḍamī narrated to us: my father narrated to me. They said: Shuʿbah narrated to us, from al-Ḥakam, from ʿUmārah ibn ʿUmayr, from Ibrāhīm ibn Abī Mūsā, from Abū Mūsā al-Ashʿarī, who used to give fatwas permitting tamattuʿ. A man said to him, “Hold back on some of your fatwas, for you do not know what the Commander of the Faithful has introduced regarding the pilgrimage rites after you.” Later I met him and asked him about it. He said: ʿUmar said, “I know that the Messenger of God (peace and blessings be upon him) did it, as did his Companions. But I disliked that they should keep resting with their wives under the arāk trees, then set out for Hajj with their heads still dripping [from washing after intercourse].”