Hazrat Khadijah (radhiyallahu ‘anha) requested Rasulullah (sallallahu ‘alaihi wasallam) to come close to her. As Rasulullah (sallallahu ‘alaihi wasallam) came close to her, she removed her scarf, exposing the hair of her head. She then asked, “Are you still able to see Hazrat Jibreel (‘alaihis salaam) now?” When Rasulullah (sallallahu ‘alaihi wasallam) replied in the negative, she remarked, “Glad tidings unto you! By Allah Ta‘ala, this is an angel, not Shaitaan (as angels will not remain in a place where a woman’s hair is exposed).”

(Extracted from Seeratul Mustafa 1/142)