(88) باب مَا جَاءَ فِي التَّجَافِي فِي السُّجُودِ
Ubaidallah bin Abdullah bin Arqam Al-Khuza'I narrated from his father (Abdullah bin Arqam), who said:
"I was with my father at the plains of Namirah. I passed by a mount and saw Allah's Messenger standing in Salat." He said: "I was looking at the earthiness of his armpits when he prostrated." [That is]: "Whiteness." (ID)
Reference (ID): Jami` at-Tirmidhi 274 (ID)
In-book reference (ID): Book 2, Hadith 126 (ID)
English translation (ID): Vol. 1, Book 2, Hadith 274 (ID)