Sahih Muslim 178b

Muhammad ibn Bashshar narrated to us: Mu‘adh ibn Hisham narrated to us: my father narrated to us. Hajjaj ibn al-Sha‘ir also narrated to me: ‘Affan ibn Muslim narrated to us: Hammam narrated to us. Both of them narrated from Qatada, from ‘Abdullah ibn Shaqiq, who said: I said to Abu Dharr, ‘If I had seen the Messenger of Allah (peace and blessings be upon him), I would have asked him.’ He asked, ‘What would you have asked him about?’ I said, ‘I would have asked him whether he had seen his Lord.’ Abu Dharr said, ‘I did ask him, and he replied: “I saw Light.”’