It is narrated from Sayyiduna Rifa’ah bin Rafi’ (may Allah be pleased with him) that a man entered the mosque and performed prayer, then the complete hadith is mentioned. He says that the Noble Prophet (peace and blessings of Allah be upon him) said: "Then when you bow (in ruku’), place your hands firmly on your knees until your bones become settled (i.e., you are at ease) in ruku’."