CHAPTER: Placing The Hands On The Knees (During Ruku’).
Musab b Saad said: I prayed by the side of my father. I put both of my hands between my knees (in bowing condition). He prohibited me from it. I then repeated; so he said: Do not do so, because we used to do so. But we were prohibited to do that, and commanded to put our hands on the knees.
Abdullah (bin Masud) said: When any of you bows, he should spread his arms on his thighs and clap both his palms (Placing them between the knees), as if I am seeing the variation of the fingers of the Messenger of Allah صلی اللہ علیہ وسلم.