'Themselves' in the Bible

But [in those days] false prophets arose among the people, just as there will be false teachers among you, who will subtly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction on themselves.

They promise them liberty, when they themselves are the slaves of depravity—for by whatever anyone is defeated and overcome, to that [person, thing, philosophy, or concept] he is continually enslaved.