Romans 6:6

Clement of Alexandria Stromata Book IV

But to us the apostle says, "Now we know this, that our old man is crucified with Him, that the body of sin might be destroyed, that henceforth we should not serve sin."[78]

Clement of Alexandria Stromata Book VII

For "to bring themselves into captivity," and to slay themselves, putting to death "the old man, who is through lusts corrupt," and raising the new man from death, "from the old conversation," by abandoning the passions, and becoming free of sin, both the Gospel and the apostle enjoin.[24]

Tertullian On the Resurrection of the Flesh

For that must be living after the world, which, as the old man, he declares to be "crucified with Christ,"[319]

Tertullian On the Resurrection of the Flesh

Besides, if we do not understand it in this sense, it is not our bodily frame which has been transfixed (at all events), nor has our flesh endured the cross of Christ; but the sense is that which he has subjoined, "that the body of sin might be made void, "[320]

Tertullian On the Resurrection of the Flesh

by an amendment of life, not by a destruction of the substance, as he goes on to say, "that henceforth we should not serve sin; "[321]