Take the Book of Allah as your leader (imâm) and be pleased with it as a judge and ruler. It is what your Messenger left amongst you. It will be an intercessor for you. It is to be obeyed. It is a witness never doubted. In it is a mention of you and those before you, and judgment for whatever happens amongst you. And in it is news about you and whatever will come after you.

‘Ubay b. Ka’b's advice – Allah be pleased with him