Musannaf Ibn Abi Shayba 21:538

Jarir narrated to us, from Mansur, from Hilal, from Abu Shu'bah, who said: I was beside Ibn Umar at Arafat, and my knee was touching his knee, or my thigh was touching his thigh. I did not hear him add anything to these words: "There is no god but Allah alone, He has no partner, to Him belongs the dominion, and to Him belongs the praise, and He is capable of all things," until he departed from Arafat to Jam' (Muzdalifah).