Will an unbeliever die, one who swore by God not to return to a certain act, and if he returned to it he would die upon disbelief, then he returned and died?

Swearing by disbelief to do or not do something is a reprehensible act. Whoever swears by a religion other than Islam, falsely and intentionally, is as he said. And whoever swears by disbelief intending it, is a disbeliever. However, if one swears by disbelief to prevent himself from doing something, and then does it, he does not become a disbeliever thereby, but must offer expiation for an oath. So, if he says, "He is a Jew or a Christian if he does such and such," and then he does it, he must offer expiation for an oath and does not become a disbeliever thereby, by scholarly consensus, unless he intended for disbelief to occur upon the fulfillment of the condition. And if one who swore by disbelief dies, having broken his oath, his guardian shall offer expiation on his behalf from his estate.