But now is Christ risen from the dead, and become the firstfruits of them that slept. For since by man came death, by man came also the resurrection of the dead. For as in Adam all die, even so in Christ shall all be made alive.
1 Corinthians 15:20-22
He has truly risen himself, and he has risen in this very quality and character, as the first-fruits of those who sleep in him. As he has assuredly risen, so in his resurrection there is as much an earnest given that the dead in him shall rise as there was that the Jewish harvest in general should be accepted and blessed by the offering and acceptance of the first-fruits. The whole lump was made holy by the consecration of the first-fruits (Rom. 11:16), and the whole body of Christ, all that are by faith united to him, are by his resurrection assured of their own. As he has risen, they shall rise; just as the lump is holy because the first fruits are so. He has not risen merely for himself, but as head of the body, the church; and those that sleep in him God will bring with him, 1 Th. 4:14 . Note, Christ’s resurrection is a pledge and earnest of ours, if we are true believers in him; because he has risen, we shall rise. We are a part of the consecrated lump, and shall partake of the acceptance and favour vouchsafed the first-fruits. This is the first argument used by the apostle in confirmation of the truth; and it is, 2. Illustrated by a parallel between the first and second Adam. For, since by man came death, it was every way proper that by man should come deliverance from it, or, which is all one, a resurrection.
And so, as in Adam all die, in Christ shall all be made alive; as through the sin of the first Adam all men became mortal, because all derived from him the same sinful nature, so through the merit and resurrection of Christ shall all who are made to partake of the Spirit, and the spiritual nature, revive, and become immortal. All who die die through the sin of Adam; all who are raised, in the sense of the apostle, rise through the merit and power of Christ. But the meaning is not that, as all men died in Adam, so all men, without exception, shall be made alive in Christ; for the scope of the apostle’s argument restrains the general meaning. Christ rose as the first-fruits; therefore those that are Christ’s shall rise too.
Matthew Henry’s Commentary