John Chrysostom
"But Christ has risen from the dead, the firstfruits of those who have fallen asleep" (1 Cor 15:20). Having shown how much evil can arise from unbelief in the resurrection, he again repeats, "But Christ has risen from the dead."
He constantly adds "from the dead" in order to stop the mouths of heretics. "The firstfruits of those who have fallen asleep." If He is the firstfruits, then they too must rise.
But if, under the name of resurrection, the Apostle were speaking about liberation from sins, and no one is without sin, since even Paul himself says, "Though I know nothing against myself, yet I am not thereby justified" (1 Cor 4:4), then who, in your view, will rise?
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It is clear that he is speaking about the resurrection of bodies. To make this beyond doubt, he constantly points to Christ, who rose in the flesh. Then he also gives the reason.
For, as I have said, when something is asserted but no reason is given, the teaching is not so quickly accepted by many.