Majma al-Zawaid — Hadith 2757

Ubaydullah bin Abdullah bin Aqram narrates from his father, from his grandfather, that he said: I was grazing goats on the plain of Namirah when I saw the Prophet (peace and blessings be upon him). He halted there, had the iqamah called for the prayer and led his Companions in prayer, and I prayed with them. It is as if I can still see the reddish-white of the skin beneath the shoulders of the Prophet (peace and blessings be upon him); the Prophet (peace and blessings be upon him) was in prostration at that time.
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir from Sayyiduna Aqram, in the same form as it is mentioned here, while Imam Abu Dawud and others recorded it from Sayyiduna Abdullah bin Aqram himself; its narrators are thiqat (trustworthy).