Sahih Muslim | Book 1 | Hadith Number 342

Narrated by Abdullah b. Shaqiq
Abdullah b. Shaqiq reported: 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.