Hadith 2072
´It was narrated that 'Aishah said:` "The Messenger of Allah swore to keep away from his wives and declared them as unlawful for him, so he made something permissible forbidden, and he offered expiation for having sworn to do so."
Hadith 2073
´It was narrated from Sa'eed bin Jubair that Ibn 'Abbas said:` "For the one who makes unlawful is the swearing." (Sahih)And Ibn 'Abbas used to say: "You had the best example in the Messenger of Allah." (33:21)