Surah 53. An-Najm, Ayah 6

 Gabriel used to come to the Prophet in a human form. But he appeared to him (ﷺ) twice in his angelic form: once at the beginning of the Prophet’s mission (when the angel manifested himself, filling the horizon, the Prophet (ﷺ) lost his consciousness), and another time during the Prophet’s Night Journey to the seventh heaven to receive the order to pray directly from Allah (see 17:1).