Romans 6:13-16 says...

Do not offer the parts of your body to serve as sin, as things to be used in doing evil. Instead, offer yourselves to God as people who have died and now live. Offer the parts of your body to God to be used in doing good. Sin will not be your master, because you are not under the law but under God's grace. So what should we do? Should we sin because we are under grace and not under law? No! Surely you know that when you give yourselves like slaves to obey someone, then you are really slaves to that person, which brings spiritual death, or you can obey God, which makes you right with him.