The best reciter among us is Ubayy, and the most knowledgeable in judgment among us is Ali, yet we set aside some of what Ubayy says. That is because Ubayy says, "I will not abandon anything I heard from the Messenger of Allah ﷺ," while Allah the Exalted has said, "Whatever verse We abrogate or cause to be forgotten" [Baqarah 2:106].
أقرؤنا أبي، وأقضانا علي، وإنا لندع من قول أبي، وذاك أن أبيا يقول: لا أدع شيئا سمعته من رسول الله ﷺ وقد قال الله تعالى: {ما ننسخ من ءاية أو ننساها}.
Bukhari narrated it in the tafsir (4481) from Amr bin Ali, who said, Yahya narrated to us, who said, Sufyan narrated to us, from Habib, from Saeed bin Jubayr, from Ibn Abbas, who said, Umar said, then he mentioned it.As for the saying of Ubayy, "I will not abandon anything," meaning, I will not leave out anything I heard from the Messenger of Allah ﷺ, meaning that he did not hold the view that anything in the Quran had been abrogated. So Umar responded to him, arguing with the words of Allah Almighty, "Whatever verse We abrogate or cause to be forgotten" [Baqarah 2:106], which indicates that abrogation does occur.As for "nunsiha" [Baqarah 2:106], this is the reading of Ibn Kathir and Abu Amr, and it means "We delay it." As for "nansaha" [Baqarah 2:106], this is the reading of the rest, from forgetting, meaning that Allah establishes in the heart of the Prophet ﷺ whatever He wills, in accordance with His saying, "We will make you recite, so you will not forget" [Ala 87:6], and He makes His Prophet forget whatever He wills and abrogates it.This contains a refutation of the Jews, who claim that abrogation is impossible in the rulings of Allah Almighty, despite the fact that abrogation occurred in His earlier scriptures and past laws, such as the permissibility, in the time of Adam, of marrying his daughters to his sons, which was later forbidden. Likewise, Allah permitted Nuh, after he left the ark, to eat all animals, then abrogated the permissibility of some of them. In the same way, Isa abrogated some of the rulings of the Torah, such as abandoning work on the Sabbath. Just so, the Quran abrogated some of the rulings that the scholars of the Christians had introduced into their religion, such as permitting the eating of pork and venerating the cross. To Allah belongs absolute authority, He establishes whatever He wills and abrogates whatever He wills. Indeed, Allah is capable of all things.