It was narrated from Muhammad bin Maslamah that when the Messenger of Allah صلی اللہ علیہ وآلہ وسلم stood to offer a voluntary prayer, he would say when he bowed:(Allah, to You I have bowed, in You I believe, to You I have submitted and in You I put my trust. You are my Lord. My hearing, my sight, my flesh, my blood, my brain and my sinews are humbled before Allah, the Lord of the Worlds).” (Sahih)