I asked the Messenger of Allah (ﷺ): Did you see thy Lord? He said: (He is) Light; how could I see Him?
Sahih Muslim Book 1, Hadith 348
← Previous Hadith I said to 'A'isha: What about the words of Allah:" Then he drew nigh and came down, so he was at a distance of two bows or closer still: so He revealed to His servant what He revealed" (al-Qur'an, liii. 8-10)? She said: It implies Gabriel. He used to come to him (the Holy Prophet) in the shape of men; but he came at this time in his true form and blocked up the horizon of the sky.

Sahih Muslim Book 1, Hadith 347 Next Hadith → I said to Abu Dharr: Had I seen the Messenger of Allah, I would have asked him. He (Abu Dharr) said: What is that thing that you wanted to inquire of him? He said: I wanted to ask him whether he had seen his Lord. Abu Dharr said: I, in fact, inquired of him, and he replied: I saw Light.

Sahih Muslim Book 1, Hadith 349