Narrated Abdullah ibn Abbas: The Prophet صلی اللہ علیہ وسلم said: If anyone takes a vow but does not name it, its atonement is the same as that for an oath, if anyone takes a vow to do an act of disobedience, its atonement is the same as that for an oath, if anyone takes a vow he is unable to fulfill, its atonement is the same as that for an oath, but if anyone takes a vow he is able to fulfill, he must do so. Abu Dawud said: This tradition has been transmitted by Waki and others on the authority of Abdullah bin Saeed bin Abi al-Hind, but they traced it no farther back than Ibn Abbas.