"I leave among you two precious and weighty trusts,
one being the Book of God and the other my Progeny.
These two legacies will never be separated from each other,
and if you lay firm hold of them you will never go astray."
Muslim, al-Sahih, Vol. VII, p. 122; al-Tirmidhi, Jami' al-Sahhi, Vol. II, p. 308.