They promise them freedom, while they themselves are slaves to depravity. For a man is a slave to whatever has mastered him.
KJV
While they promise them liberty, they themselves are the servants of corruption: for of whom a man is overcome, of the same is he brought in bondage.
ASV
promising them liberty, while they themselves are bondservants of corruption; for of whom a man is overcome, of the same is he also brought into bondage.