Answer
(Fatwa: 172/172/M=1431)
By failing oath if you mean that he could not fulfil the oath and turned hanis (committed what he swore not to do) then kaffarah (expiation) is wajib on him. One kind of kaffarah is to feed ten poor two times to their hearts content, or dress ten poor, and if someone is not able to do so, he can keep fast three days continuously. In the above-mentioned question, what are the words of swearing one spoke many a time? What was his intention? If the nature of all the oaths is different, there would be separate kaffarah for each oath.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband