Sahih Muslim

Sahih Muslim 178 a

The saying of the Prophet (saws): "Light, How could I see Him?" and: "I saw Light"
Arabic hadith text
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 ‏"
Translation
It is narrated on the authority of Abu Dharr

I asked the Messenger of Allah (ﷺ): Did you see thy Lord? He said: (He is) Light; how could I see Him?