1 Faustus said: You ask, If Jesus was not born, how did He die? Well this is a probability, such as one makes use of in want of proofs. We will, however, answer the question by examples taken from what you generally believe. If they are true, they will prove our case; if they are false, they will help you no more than they will us. You say then, How could Jesus die, if He were not man? In return, I ask you, How did Elias not die, though he was a man? Could a mortal encroach upon the limits of immortality, and could not Christ add to His immortality whatever experience of death was required?
If Elias, contrary to nature, lives for ever, why not allow that Jesus, with no greater contrariety to nature, could remain in death for three days? Besides that, it is not only Elias, but Moses and Enoch you believe to be immortal, and to have been taken up with their bodies to heaven. Accordingly, if it is a good argument that Jesus was a man because He died, it is an equally good argument that Elias was not a man because he did not die. But as it is false that Elias was not a man, notwithstanding his supposed immortality, so it is false that Jesus was a man, though He is considered to have died.
The truth is, if you will believe it, that the Hebrews were in a mistake regarding both the death of Jesus and the immortality of Elias. For it is equally untrue that Jesus died and that Elias did not die. But you believe whatever you please; and for the rest, you appeal to nature. And, allowing this appeal, nature is against both the death of the immortal and the immortality of the mortal. And if we refer to the power of effecting their purpose as possessed by God and by man, it seems more possible for Jesus to die than for Elias not to die; for the power of Jesus is greater than that of Elias.
But if you exalt the weaker to heaven, though nature is against it, and, forgetting his condition as a mortal, endow him with eternal felicity, why should I not admit that Jesus could die if He pleased, even though I were to grant His death to have been real, and not a mere semblance? For, as from the outset of His taking the likeness of man He underwent in appearance all the experiences of humanity, it was quite consistent that He should complete the system by appearing to die.
Source: Reply to Faustus the Manichaean (New Advent)