Sahih Muslim Book 001, Hadith Number 0340.
Chapter : The meaning of the words of Allah: "He saw Him in another descent" (Al-Qur'an 2, liii. 13).Did the Apostle (may peace be upon him) see his Lord on the night of his journey (to Heaven) ?.
Masruq reported: I said to 'Aisha: 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.