What did the Prophet Muhammad (saw) say about someone who takes an oath on a religion other than Islam?
 In the hadith narrated by Shu'ba the words are:                      Verily the Messenger of Allah (may peace be upon him) said: He who took an oath on a religion other than Islam as a liar would become so as he said, and he who slaughtered himself with a thing would be slaughtered with that on the Day of Resurrection.