Sahih Muslim , Book 1, Hadith 341 (USC-MSA) ⓘ
It is narrated on the authority of Abu Dharr: I asked the Messenger of Allah: Did you see thy Lord? He said: (He is) Light; how could I see Him?
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ يَزِيدَ بْنِ إِبْرَاهِيمَ، عَنْ قَتَادَةَ، عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ، عَنْ أَبِي ذَرٍّ، قَالَ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم هَلْ رَأَيْتَ رَبَّكَ قَالَ " نُورٌ أَنَّى أَرَاهُ " .
also referenced under: Book 1, Hadith 350 (In-Book) & Hadith 178 (Reference)