Hadith 300:2
Abu al-Nadr narrated to us, he said: Ayyub ibn Utbah narrated to us, Abdullah ibn Badr narrated to us, from Abd al-Rahman ibn Ali ibn Shayban, from his father, that the Messenger of Allah, peace and blessings of Allah be upon him, said: "Allah, the Almighty and Majestic, does not look at a man who does not straighten his back between his bowing and his prostration."
حدثنا أبو النضر، قال: حدثنا أيوب بن عتبة، حدثنا عبد الله بن بدر، عن عبد الرحمن بن علي بن شيبان، عن أبيه، أن رسول الله صلى الله عليه وسلم قال: " لا ينظر الله عز وجل إلى رجل لا يقيم صلبه بين ركوعه وسجوده "