Jesus is still sitting there at the right hand of the Father, man, yet God—the last Adam, yet the primary Word—flesh and blood, yet purer than ours—who “shall descend in like manner as He ascended into heaven” the same both in substance and form, as the angels affirmed, so as even to be recognised by those who pierced Him. Designated, as He is, “the Mediator between God and man,” He keeps in His own self the deposit of the flesh which has been committed to Him by both parties—the pledge and security of its entire perfection. For as “He has given to us the earnest of the Spirit,” so has He received from us the earnest of the flesh, and has carried it with Him into heaven as a pledge of that complete entirety which is one day to be restored to it. Be not disquieted, O flesh and blood, with any care; in Christ you have acquired both heaven and the kingdom of God. Otherwise, if they say that you are not in Christ, let them also say that Christ is not in heaven, since they have denied you heaven.
Tertullian
On the Resurrection of the Flesh
Chapter LI