Muhammad b. Musa b. al-Mutawakkil narrated to us. He said: Muhammad b. Yahya al-`Attar narrated to us. He said: Muhammad b. Ahmad b. Yahya b. `Imran al-Ash`ari narrated to us from Ahmad b. Hilal from `Isa b. `Abdullah from his father from his grandfather from his forefathers. He said:

The Messenger of Allah (s) said: Whoever recites qul huwallahu ahad when he goes to bed, Allah will forgive fifty years of his sins.