Sahih Bukhari
Asking Permission
Volume: 008 / Book Number: 074 / Hadith Number: 266
Narrated 'Aisha:
Allah's Apostle said, "O 'Aisha! This is Gabriel sending his greetings to you." I said, "Peace, and Allah's Mercy be on him (Gabriel). You see what we do not see." (She was addressing Allah's Apostle).