Abdullah ibn Sinan narrated from Abu Abdillah عليه السلام, who said: (Imam عليه السلام said) “Recite ‘Qul huwa Allahu ahad’ and ‘Qul ya ayyuhal-kafirun’ at the time of sleep, for indeed, it is a declaration of disassociation from shirk. And ‘Qul huwa Allahu ahad’ is the description of the Lord عز وجل.”