Mukhtasar Muslim

Abu’l-Ahwas says: We were in the house of Abu Musa (may Allah be pleased with him), and there were several companions of Abdullah ibn Mas’ud (may Allah be pleased with them both) there, and they were looking at a copy of the Qur’an, when suddenly Abdullah (may Allah be pleased with him) stood up. Abu Mas’ud said: I do not know that the Messenger of Allah (peace and blessings be upon him) left behind anyone after him who knew the Qur’an better than the person who has just stood up. Abu Musa (may Allah be pleased with him) said: If you say this (then it is correct), and his condition was such that when we were absent, he was present, and when we were prevented, he was granted permission (to go to the Messenger of Allah).