John Chrysostom

And again he establishes it all, and takes it up again, saying, "For if the dead are not raised, neither hath Christ been raised." For had He not intended to do this, He would not have come into the world. And he names not this, but the end, to wit, His resurrection; through it drawing all things.

Homily on 1 Corinthians 39 ↗

Theophylact of Ohrid

Again he defends the same proposition. For He rose for the purpose of bringing about the universal resurrection. But if there is no resurrection, then He too has not risen; if this is admitted, then your faith is in vain: which is absurd. "You are still in your sins." If He has not risen, then He did not die, and if He did not die, then He did not destroy sin either: for His death is for the destruction of sin. For it is said: "Behold the Lamb of God, who takes away the sin of the world" (Jn. 1:29). …

Commentary on 1 Corinthians ↗

Cosmas Indicopleustes

For if the dead rise not, neither hath Christ risen, but if Christ hath not risen, your faith is vain—-ye are yet in your sins; from that which was confessed and believed in by them, he confutes them and says: for if He, concerning whom you have believed, when He was dead rose again, why do you doubt the resurrection of the other dead, so that you make it appear that you have believed in vain about the resurrection of but one. For he, who is able to raise one of the dead, is able also to raise all the others that are dead. …

The Christian Topography, Book 7 ↗