Sahih Muslim 177a

Zuhayr ibn Harb narrated to me: Isma'il ibn Ibrahim narrated to us, from Dawud, from al-Sha'bi, from Masruq, who said: I was reclining with 'A'isha when she said, 'O Abu 'A'isha, whoever says any one of three things has uttered a grave falsehood against Allah.' I asked, 'What are they?' She said, 'Whoever claims that Muhammad (peace and blessings be upon him) saw his Lord has uttered a grave falsehood against Allah.' I had been reclining, but I sat up and said, 'Mother of the Believers, give me a moment and do not hurry me. Has Allah, Mighty and Majestic, not said: “He certainly saw him on the clear horizon” and “He certainly saw him another time”?' She said, 'I was the first of this community to ask the Messenger of Allah (peace and blessings be upon him) about that. He said: “It is only Gabriel. I have not seen him in the form in which he was created except on these two occasions. I saw him descending from heaven, his immense created form filling the space between heaven and earth.”' She said, 'Have you not heard Allah say: “Vision cannot perceive Him, but He perceives all vision; He is the Subtle, the All-Aware”? And have you not heard Allah say: “It is not for any human being that Allah should speak to him except by revelation, from behind a veil, or by sending a messenger who reveals, by His permission, whatever He wills. He is Most High, Most Wise”?' She said, 'Whoever claims that the Messenger of Allah (peace and blessings be upon him) concealed anything from the Book of Allah has uttered a grave falsehood against Allah. Allah says: “O Messenger, convey what has been sent down to you from your Lord; if you do not, then you have not conveyed His message.” Whoever claims that he knows what will happen tomorrow has uttered a grave falsehood against Allah. Allah says: “Say: No one in the heavens and earth knows the unseen except Allah.”'