It wasnarrated that Rashid said:
"I heard Wabisah bin Ma'bad saying:'Isaw the Messenger of Allah (ﷺ) performing prayer, and when hebowedhe made his back so straight that if water were poured on it, itwould have stayed there.'" (AR)
English reference (AR): Vol. 1, Book 5, Hadith 872 (AR)
Arabic reference (AR): Book 5, Hadith 921 (AR)