I was with Ibn Umar at Arafat. When he set out, I went with him until he reached the imam, prayed the noon and afternoon prayers with him, and then stood with him along with some of my companions until the imam departed. We departed with him until we reached the narrow pass before the two mountain defiles. He made his camel kneel, and we made ours kneel as well, thinking he intended to pray.His servant, who was holding his mount, said, "He does not intend to pray. Rather, he recalled that when the Prophet ﷺ reached this spot, he relieved himself, and so he wishes to do the same."
حدثنا يزيد بن هارون أخبرنا عبد الملك
كنت مع ابن عمر بعرفات فلما كان حين راح رحت معه حتى أتى الإمام فصلى معه الأولى والعصر ثم وقف معه وأنا وأصحاب لي حتى أفاض الإمام فأفضنا معه حتى انتهينا إلى المضيق دون المأزمين فأناخ وأنخنا ونحن نحسب أنه يريد أن يصلي فقال غلامه الذي يمسك راحلته إنه ليس يريد الصلاة ولكنه ذكر أن النبي ﷺ لما انتهى إلى هذا المكان قضى حاجته فهو يحب أن يقضي حاجته
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Its isnad is sahih. Abdul-Malik is Ibn Abu Sulayman al-Arzami. As for the fact that the boy who was holding Ibn Umar's mount is unnamed, this does not, in my view, harm the soundness of the isnad, because Anas bin Sirin narrated this while he and Ibn Umar were together in the same caravan. Had Anas doubted the boy's report, he would not have stayed silent, and he would have asked Ibn Umar about it. The circumstantial indicators and the context support the truthfulness of the boy in what he related.