Acts 8:23
"For I perceive that you still stand in the gall of bitterness and in the bondage of unrighteousness."
Hebrews 12:15
Look carefully that there be no one who falls back from the grace of God; that no root of bitterness springs up to trouble you, and by its means many become defiled.
John 8:34
"In solemn truth I tell you," Jesus replied, "every one who commits sin is a slave
Romans 6:17-22
But God be thanked that you who were once the slaves of sin have obeyed from your hearts that type of teaching to which you were appointed;
Titus 3:3
For we were ourselves once foolish, disobedient, deceived, slaving for various lusts and pleasures, passing our lives in malice and envy. We were hateful, and we hated one another.
2 Peter 2:4
For if God did not spare angels when they sinned, but cast them down to Tartarus, and committed them to chains of darkness, and reserved them for judgment;
2 Peter 2:19
They promise them liberty, while they themselves are slaves of rottenness! (For indeed a man is the slave of anything which masters him.)