Mishkat al-Masabih 4 Prayer كتاب الصلاة 621

وَعَنْ أَبِي ذَرٍّ قَالَ: قَامَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ حَتَّى أَصْبَحَ بِآيَةٍ وَالْآيَةُ: (إِنْ تُعَذِّبْهُمْ فَإِنَّهُمْ عِبَادُكَ وَإِنْ تَغْفِرْ لَهُمْ فَإنَّك أَنْت الْعَزِيز الْحَكِيم) رَوَاهُ النَّسَائِيّ وَابْن مَاجَه

Abu Dharr said that God’s Messenger kept awake during the night till morning reciting one verse, which was, “If Thou punishest them they are Thy servants; and if Thou forgivest them Thou art the Mighty, the Wise”(Al-Qur’an; 5:118). Nasa’i and Ibn Majah transmitted it.