820 - Ibn Bashshar narrated to us, Yahya narrated to us, Ja'far narrated to us, from Abu 'Uthman, from Abu Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, commanded me to call out: "Indeed, there is no prayer without reciting the Opening of the Book, and whatever more (one recites)."(1)

821 - Al-Qa'nabi narrated to us, from Malik, from al-'Ala' ibn 'Abd al-Rahman, that he heard Abu al-Sa'ib, the freed slave of Hisham ibn Zuhrah, say:
I heard Abu Hurayrah say: The Messenger of Allah, peace and blessings be upon him, said: "Whoever performs a prayer in which he does not recite the Mother of the Qur'an, it is deficient, it is deficient, it is deficient, not complete."
He said: So I said: O Abu Hurayrah, sometimes I am behind the Imam! He said: He pressed my forearm and said: Recite it to yourself, O Persian, for I heard the Messenger of Allah, peace and blessings be upon him, say: "Allah, Mighty and Majestic, said: I have divided the prayer between Me and My servant into two halves:--------------------------------------------
= And it was also narrated with the same wording as the narration of 'Abd al-Karim ibn Rashid by al-Khatib al-Baghdadi in his "Tarikh" 4/216 via the chain of Nu'aym ibn Hammad, from Ibn al-Mubarak, from Abu Hanifah, from 'Ata' ibn Abi Rabah, from Abu Hurayrah. In its chain, there is weakness reaching Nu'aym, and Nu'aym is weak in memory.
(1) Authentic due to corroborating evidence, but this chain is weak like the preceding one. Ibn Bashshar: he is Muhammad, nicknamed Bundar, and Yahya: he is Ibn Sa'id al-Qattan.
It was also narrated by Ahmad (9529), Ishaq ibn Rahawayh in his "Musnad" (126), al-Bukhari in "al-Qira'ah Khalf al-Imam" (7), (84), and (300), Ibn al-Jarud (186), al-'Uqayli in "al-Du'afa'" 1/190, Ibn Hibban (1791), al-Daraqutni in "al-Sunan" (1224), al-Hakim 1/239, Abu Nu'aym in "al-Hilyah" 7/124, and al-Bayhaqi in "al-Sunan" 2/37, 59, and 375, and in "al-Qira'ah Khalf al-Imam" (38-43) and (45) via multiple chains from Ja'far ibn Maymun, with it.
It is corroborated by the hadith of Abu Sa'id al-Khudri mentioned previously under number (818), and the hadith of 'Ubadah ibn al-Samit coming later under number (822).