Yahya related to me from Malik from Nafi that Abdullah ibn Umarused to say, "When one of you puts his forehead on the ground heshould put his palms on the place where he puts his forehead. Then,when he rises, he should raise them, for the hands prostrate just asthe face prostrates."
USC-MSA web (English) reference: Book 9, Hadith 63
Arabic reference: Book 9, Hadith 394