General Behavior (Kitab Al-Adab)
43/107. Chapter:
What to say when going to sleep
Sunan Abi Dawud
حَدَّثَنَا النُّفَيْلِيُّ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا أَبُو إِسْحَاقَ، عَنْ فَرْوَةَ بْنِ نَوْفَلٍ، عَنْ أَبِيهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ لِنَوْفَلٍ " اقْرَأْ { قُلْ يَا أَيُّهَا الْكَافِرُونَ } ثُمَّ نَمْ عَلَى خَاتِمَتِهَا فَإِنَّهَا بَرَاءَةٌ مِنَ الشِّرْكِ " .
Farwah b. Nawfal quoted his father as saying that the Prophet (ﷺ) said to Nawfal (his father): Recite (the Surah) 'Say, O you disbelievers!' and then go to sleep at its end, for it is a declaration of freedom from polytheism.
Reference : Sunan Abi Dawud 5055In-book reference : Book 43, Hadith 283English translation : Book 42, Hadith 5037