Arabic (Original)
حَدَّثَنَا أَسْوَدُ بْنُ عَامِرٍ أَخْبَرَنَا إِسْرَائِيلُ عَن أَبِي إِسْحَاقَ عَن عَبْدِ اللَّهِ بْنِ يَزِيدَ الْأَنْصَارِيِّ عَنِ الْبَرَاءِ بْنِ عَازِبٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ إِذَا نَامَ وَضَعَ يَدَهُ الْيُمْنَى تَحْتَ خَدِّهِ وَقَالَ اللَّهُمَّ قِنِي عَذَابَكَ يَوْمَ تَبْعَثُ عِبَادَكَ.
English Translation
Aswad ibn Amir told us, Isra'il informed us, from Abu Ishaq, from Abdullah ibn Yazid al-Ansari, from al-Bara' ibn Azib, that the Prophet, peace and blessings be upon him, when he slept, would place his right hand under his cheek and say: "O Allah, protect me from Your punishment on the Day You raise up Your servants."