The Messenger of Allah ﷺ said, "Whoever performs a prayer without reciting Umm al-Kitab in it, it is deficient and incomplete."I said, "Abu Hurayrah, sometimes I am behind the imam."He pinched my arm and said, "Persian, recite it to yourself."
حدثنا إسماعيل عن ابن جريج أخبرني العلاء بن عبد الرحمن بن يعقوب أن أبا السائب أخبره أنه
قال رسول الله ﷺ من صلى صلاة لم يقرأ فيها بأم الكتاب فهي خداج غير تمام قلت يا أبا هريرة إني أكون أحيانا وراء الإمام فغمز ذراعي وقال يا فارسي اقرأها في نفسك
Its chain of transmission is sahih. Abu Saaib is the freedman of Abdullah bin Hisham bin Zahra. He is sometimes mentioned as the freedman of Hisham bin Zahra, and other times as the freedman of Abdullah bin Zahra. The matter is close either way, sometimes he is attributed to the clientship of Abdullah, sometimes to the clientship of Abdullah's father, and sometimes he is attributed to the clientship of Abdullah while Abdullah himself is attributed to his grandfather.This Abu Saaib is a trustworthy successor. Ibn Hibban mentioned him among the trustworthy narrators. Ibn Abdul-Barr said they agreed that he is trustworthy and his transmission is accepted. Ibn Saad gave his biography in Tabaqat 5:226, as did Bukhari in Kuna number 331.The hadith was narrated by Ibn Majah, 838, from Abu Bakr bin Abu Shayba, from Ismail bin Ulaya, with this chain. Malik narrated it in Muwatta, at greater length, 84-85, from Ala, from Abu Saaib, with the same wording. It will come later in the Musnad through Malik's route, 9934. Abdul-Razzaq also narrated it from Ibn Jurayj, from Ala. It will also come later at 7823.Muslim narrated it, 1:116, through the narration of Malik, and through the narration of Abdul-Razzaq, both of whom took it from Ibn Jurayj. Bukhari in Kuna, in the biography of Abu Saaib, pointed to these two narrations and to most of the chains of transmission for this hadith.A similar version of it has already appeared at greater length at 7289, through the narration of Sufyan bin Uyayna, from Ala bin Abdul-Rahman, from his father, from Abu Hurairah. We have pointed out many of its routes there, including this one, and explained there that Ala narrated it both from his father and from Abu Saaib, each of whom related it to him from Abu Hurairah.