Romans 6:16
Know you not, that to whom you yield yourselves servants to obey, his servants you are to whom you obey; whether of sin unto death, or of obedience unto righteousness?
John 8:34
Jesus answered them, Verily, verily, I say unto you, Whosoever commits sin is the servant of sin.
2 Peter 2:19
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.
Matthew 6:24
No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. You cannot serve God and mammon.
Joshua 24:15
And if it seem evil unto you to serve the LORD, choose you this day whom you will serve; whether the gods which your fathers served that were on the other side of the River, or the gods of the Amorites, in whose land you dwell: but as for me and my house, we will serve the LORD.
Romans 6:12-13
Let not sin therefore reign in your mortal body, that you should obey it in its lusts.
Romans 6:17
But God be thanked, that you were the servants of sin, but you have obeyed from the heart that form of doctrine which was delivered you.
Romans 6:19-23
I speak after the manner of men because of the weakness of your flesh: for as you have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness.