Surah 53. An-Najm, Ayah 10

Lit., "whatever He revealed": an allusion to the exceptional manifestation of the angel "in his true shape and nature" as well as to the contents of divine revelation as such. In its deeper sense the above phrase implies that even to His chosen prophets God does not entirely unveil the ultimate mysteries of existence, of life and death, of the purpose for which He has created the universe, or of the nature of the universe itself.

Gabriel would be just a messenger, to do no more than convey Allah's Message to Allah's Messenger.