Narrated Ibn Abbas:
Umar said, “Our best Qur’an reciter is Ubai and our best judge is ‘Ali; and in spite of this, we leaveĀ some of the statements of Ubai because Ubai says, ‘I do not leave anything that I have heard from Allah’sĀ Apostle while Allah: “Whatever verse (Revelations) do We abrogate or cause to be forgotten but We bring a better oneor similar to it.” (2.106)
Sahih Bukhari, Volume 6, Book60, Number 8