Hazrat Ibn Mas'ud (may Allah be pleased with him) narrated: By Allah, besides whom there is no deity, I know about every surah of the Book of Allah that has been revealed, where it was revealed, and I know about every verse of the Book of Allah that has been revealed, about whom it was revealed. And if I come to know that there is someone who knows more about the Book of Allah than I do, and camels can take me to him (i.e., his house is very far), then I would travel to him and acquire that knowledge from him.