Musnad Ahmad

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."

Abdu al-Samad narrated to us, Mulazim ibn Amr narrated to us, Abdullah ibn Badr narrated to us, that Abdurrahman ibn Ali narrated to him, that his father Ali ibn Shayban narrated to him, that he said: I prayed behind the Messenger of Allah, peace and blessings be upon him, and he turned around and saw a man praying alone behind the row. The Prophet of Allah, peace and blessings be upon him, stood until the man finished his prayer, then he said to him: "Repeat your prayer, for there is no prayer for one who prays alone behind the row."

Abd al-Samad narrated to us, my father narrated to me, Abu Abdullah al-Shaqari narrated to us, Umar ibn Jabir narrated to me, from Abdullah ibn Badr, from Abdur Rahman ibn Ali, from his father, who said: I heard the Messenger of Allah, peace and blessings be upon him, say: "Indeed, Allah does not look at a man who does not straighten his back in his bowing and in his prostration."