Thematic Bible: Why the body dies

And if Christ is in you, the body is indeed dead because of sin, but the Spirit is life because of righteousness. But if the Spirit of him who raised up Jesus from the dead dwells in you, he who raised up the Christ from the dead will also give life to your mortal bodies through his Spirit that dwells in you.

But some man will say, How are the dead raised, and with what kind of body do they come? Thou foolish man, what thou sow is not made alive unless it dies. And what thou sow, thou do not sow the body that it will become, but a bare grain, if it may happen of wheat, or of some other kind. read more.
But God gives it a body as he wills, and to each of the seeds its own body.