It was narrated that Ibn 'Umar said: "The Messenger of Allah P.B.U.Hheard a man taking an oath by his father and said: 'Do
not make oaths by your forefathers. Whoever makes an oath by Allah, let him fulfill his oath, and if an oath is sworn for a person by Allah, let him accept it. Whoever is not content with Allah has nothing to do with Allah:" (Da'if)