Abu Dawood: Hadith 734

Abu Humaid, Abu Usaid, Sahl. B Sa'd and Muhammad b. Maslamah (once) got together and discussed how the Messenger of Allah (ﷺ) used to offer his prayer. Abu Humaid said: I am more informed than any of you regarding the prayer offered by the Messenger of Allah (ﷺ). Then he mentioned a part of it, and said: He then bowed and placed his hands upon his knees as if he caught hold of them; and bent them, keeping (his arms) away from his sides. He them prostrated himself and placed his nose and forehead (on the ground); and kept his arms away from his side, and placed his palms (on the ground opposite his shoulders; he then raised his head that every bone returned to its proper place; (he then prostrated twice) until he finished this prostrations). Then he sat down and spread out his left foot, putting forward the front of his right foot towards the qiblah placing the palm of his right hand on his right knee, and the palm of his left hand on his left knee, and he pointed with his finger.

Abu Dawud said: This tradition has been narrated by Ibn al-Mubarak from Fulaih who heard "Abbas . Sahl narrating it; but I do not remember it. I think he made the mention of "Isa b. "Abd Allah who heard "Abbas b. Sahl saying: I accompanied Abu Humaid al-Sa'idi.