It is narrated from Sayyiduna Ali bin Shiban (may Allah be pleased with him), he says: I came to the Messenger of Allah (peace and blessings be upon him) as part of a delegation. We performed prayer behind the Noble Prophet. The Prophet glanced from the corner of his eye at a man who was not straightening his back in bowing (ruku) and prostration (sujud). When the Prophet (peace and blessings be upon him) finished the prayer, he said: O assembly of Muslims! Indeed, that man has no prayer, who does not straighten his back in bowing and prostration.
Hadith Referenceالفتح الربانی / أبواب صفة الصلاة / 1703
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«اسناده صحيح۔ أخرجه مطولا و مختصرا ابن ماجه: 871، 1003، وابن خزيمة: 593، 667، 872، 1569، وابن ابي شيبة: 2/ 193، 14/ 156 ، (انظر مسند أحمد ترقيم الرسالة: 16297 ترقیم بيت الأفكار الدولية: 16406»