(a) Ubaydullah bin Abdullah bin Aqram al-Khuza'i narrates from his father (may Allah be pleased with him) that he was with his father at Namirah. A caravan passed by them, and they made their camels kneel at one side of the road. My father said: "Stay with your animals while I go near them and ask who these people are."
Then we both went close to the caravan. Meanwhile the time of prayer came. I saw that the Messenger of Allah (peace and blessings be upon him) was among them. Whenever he (peace and blessings be upon him) went into prostration, I would look at his (peace and blessings be upon him) armpits.
(b) Ya'qub says: The narrator said 'min Namirah', but the correct form is 'Thamirah'; he erred in this just as Ibn al-Mubarak erred.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2707