Musannaf Ibn Abi Shaybah

Hazrat Abdullah bin Abdullah bin Aqram Khuzai narrates from his father that I was with my father at the place of Namira when some riders passed by us. They camped on one side of the road. My father said to me, "O my beloved son! Stay with these animals of yours, I will be back soon." He left, so I also went along with him. I saw that the Messenger of Allah (peace and blessings be upon him) was there. He offered prayer, and I also prayed with him. During the prayer, I was observing the whiteness of the armpits of the Messenger of Allah (peace and blessings be upon him).