From Sahih Bukhari (Hadith 6201):
Narrated `Aisha:(the wife of the Prophet) Allah's Messenger (ﷺ) said, "O Aisha! This is Gabriel sending his greetings to you." I said, "Peace, and Allah's Mercy be on him." `Aisha added: The Prophet (ﷺ) used to see things which we used not to see
Reference: Bukhari 6201