Abbas that the Prophet, peace and blessings be upon him, would pray twenty rak'ahs in the month of Ramadan. (1) However, this hadith is weak and is not authentically reported from the Prophet, peace and blessings be upon him. What is authentically reported from him is what Aisha, the Mother of the Believers, may Allah be pleased with her, narrated: that he would not pray more than eleven rak'ahs. She was asked, “How was the Prophet’s prayer in Ramadan?” She replied, “He would not pray more than eleven rak'ahs in Ramadan or at any other time.” (2) This is an explicit statement from Aisha, who was among the people most knowledgeable about what he did at night.
If someone were to say: It has been mentioned that Umar instructed Ubayy ibn Ka'b to lead the people in prayer with twenty-three rak'ahs.
We reply: This too is not authentic. Rather, Yazid ibn Ruman narrated: “During Umar’s time, the people would pray twenty-three rak'ahs in Ramadan.” (3) Yet Yazid ibn Ruman did not live during Umar’s time, so there is a break in the chain of transmission. Furthermore, the hadith does not explicitly state that Umar was aware of this and approved it. Nor does the principle apply here that whatever was done during the lifetime of the Prophet, peace and blessings be upon him, without his objecting to it is implicitly traced back to him; for if the Messenger, peace and blessings be upon him, knew of it, he approved it, and if he did not know of it, then Allah Most High approved it.
However, Malik narrated in al-Muwatta, through one of the most authentic chains of transmission, that Umar ibn al-Khattab, may Allah be pleased with him, instructed Tamim al-Dari and Ubayy ibn Ka'b to lead the people in prayer with eleven rak'ahs. (4) This is an explicit text and an instruction from Umar, may Allah be pleased with him, and it is fitting of him, for he was among the people most steadfast in adhering to the sunnah. Since the Messenger, peace and blessings be upon him, did not pray more than eleven rak'ahs, we believe that Umar ibn al-Khattab