Musannaf Ibn Abi Shayba 3:1945

Muhammad ibn Bishr narrated to us, he said: Zakariya ibn Abi Za’idah narrated to us, he said: Abu al-Hasan narrated to us, from a man who claimed that he was like himself, from Sa’id ibn Jubayr, he said: ‘Abdullah ibn ‘Umar used to dismount from his riding beast, then pour water [to relieve himself], then mount again, and he would recite the prostration [verse] and prostrate, and he did not perform ablution.