Thematic Bible: Why the body dies

And if Christ is in you, the body indeed is 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 dwelleth in you, he who raised up Christ from the dead will also give life to your mortal bodies, because of his Spirit that dwelleth in you.

But some one will say, How are the dead to rise? and with what body do they come? Fool! that which thou sowest is not brought to life unless it die; and what thou sowest, not the body that shall be dost thou sow, but a bare grain, of wheat perhaps, or of some of the other grains; read more.
but God giveth it a body, as he willed, and to every seed its own body.