Yazid ibn Harun narrated to us, Ayyub ibn Utbah informed us, Abdullah ibn Badr narrated to us, he said: Abdur Rahman ibn Ali ibn Shayban al-Suhaymi narrated to us, my father narrated to me, that he heard the Prophet, peace and blessings be upon him, say: "Allah does not look at the prayer of a servant who does not straighten his back between his bowing and his prostration."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 24009/74
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف لضعف أيوب بن عتبة، لكنه توبع، وقد اختلف فيه على عبدالله بن بدر