Eusebius of Caesarea

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But if, on the contrary, after His intercourse with men, He suddenly disappeared, flying away to avoid death, He might be likened by man to a phantom. And just as if any one wished to exhibit some incombustible vessel, which triumphed over the nature of fire, he would put it into the flame, and then directly draw it out from the flame unharmed; so the Word of God, wishing to shew that the instrument which He used for the salvation of men was superior to death, exposed His mortal body to death to manifest His nature, then after a little rescued it from death by the force of His divine power. This is indeedthe first cause of Christ’s death. But the second is the manifestation of the divine power of Christ inhabiting a body. For seeing that men of old deified those who were destined to a like end with themselves, and whom they called Heroes and Gods, He taught that He alone of the dead must be acknowledged the true God, who having vanquished death is adorned with the rewards of victory, having trodden death under His feet. The third reason is, that a victim must be slain for the whole race of mankind, which being offered, the whole power of the evil spirits was destroyed, and every error put to silence. There is also another cause of the healthgiving death, that the disciples with secret faith might behold the resurrection after death. Whereunto they were taught to lift up their own hopes, that despising death they might embark cheerfully in the conflict with error.