كتاب الإيمان
1  
The Book of Faith
(79)
Chapter: The saying of the Prophet (saws): "Allah does not sleep" and "His veil is light, and if he were to remove it, the splendour of his face would burn all of his creation, as far as hs sght reaches".
(79)
باب فِي قَوْلِهِ عَلَيْهِ السَّلاَمُ: «إِنَّ اللَّهَ لاَ يَنَامُ». وَفِي قَوْلِهِ: «حِجَابُهُ النُّورُ لَوْ كَشَفَهُ لأَحْرَقَ سُبُحَاتُ وَجْهِهِ مَا انْتَهَى إِلَيْهِ بَصَرُهُ مِنْ خَلْقِهِ»
Sahih Muslim 179 b

A'mash has narrated this hadith on the same authority and said:

The Messenger of Allah (ﷺ) was standing amongst us and he told us four things. He then narrated the hadith like the one reported by Abu Mua'wiya, but did not mention the words" His creation" and said: His veil is the light.
حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ قَالَ قَامَ فِينَا رَسُولُ اللَّهِ صلى الله عليه وسلم بِأَرْبَعِ كَلِمَاتٍ ‏.‏ ثُمَّ ذَكَرَ بِمِثْلِ حَدِيثِ أَبِي مُعَاوِيَةَ وَلَمْ يَذْكُرْ ‏ "‏ مِنْ خَلْقِهِ ‏"‏ ‏.‏ وَقَالَ حِجَابُهُ النُّورُ ‏.‏
Reference : Sahih Muslim 179b
In-book reference : Book 1, Hadith 351
USC-MSA web (English) reference : Book 1, Hadith 344
  (deprecated numbering scheme)