Hazrat Ibn Abbas (may Allah be pleased with them both) narrates that Hazrat Umar, while addressing us, said: Ali (may Allah be pleased with him) is the best among us in making judgments, and Ubayy is the best among us in recitation, and we have left out some things which Ubayy used to recite. And Hazrat Ubayy used to say: I have heard the Qur'an from the Messenger of Allah (peace and blessings be upon him), and I will not leave anything from the words of the Messenger of Allah (peace and blessings be upon him). And indeed, the Book was revealed after Ubayy.