Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said: "When a person performs ruku‘, he should recite the tasbih three times, because he will be reciting tasbih with his body, and along with him, three hundred and thirty-three bones and three hundred and thirty-three veins will be glorifying Allah."
Hadith Referenceسنن الدارقطني / كتاب الصلاة / 1298
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«إسناده ضعيف ، وأخرجه الدارقطني فى ((سننه)) برقم: 1298 ، فى إسناده إبراهيم بن الفضل وهو متروك ، الإعلام بسنته عليه الصلاة والسلام بشرح سنن ابن ماجه الإمام: 323/5»