Volume 4, Book 54, Number 457:

Narrated Aisha:

Whoever claimed that (the Prophet) Muhammad saw his Lord, is committing a great fault, for he only saw Gabriel in his genuine shape in which he was created covering the whole horizon.

Volume 4, Book 54, Number 458:

Narrated Masruq:

I asked Aisha "What about His Statement:-- "Then he (Gabriel) approached And came closer, And was at a distance Of but two bow-lengths Or (even) nearer?" (53.8-9) She replied, "It was Gabriel who used to come to the Prophet in the figure of a man, but on that occasion, he came in his actual and real figure and (he was so huge) that he covered the whole horizon."