Colossians 3:5-7: Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry: 6 For which things* sake the wrath of God cometh on the children of disobedience: 7 In the which ye also walked some time, when ye lived in them.
Our sins are our members. They are a part of our flesh much like our fingers, hands, toes and feet. We are to mortify (kill) our sins.
Romans 8:13: For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live.
Romans 6:11: Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
We should reckon that we are dead to sin and we should not live in it.
John 5:14: Afterward Jesus findeth him in the temple, and said unto him, Behold, thou art made whole: sin no more, lest a worse thing come unto thee.
John 8:11: She said, No man, Lord. And Jesus said unto her, Neither do I condemn thee: go, and sin no more.
Jesus had healed the impotent man in John 5 and saved the woman in John 8 from a stoning. When we do business with Jesus, two vitally important parts of the business are always that our sins have been forgiven and that we should strive to stop sinning.
1 Peter 3:10-13: For he that will love life, and see good days, let him refrain his tongue from evil, and his lips that they speak no guile: 11 Let him eschew evil, and do good; let him seek peace, and ensue it. 12 For the eyes of the Lord are over the righteous, and his ears are open unto their prayers: but the face of the Lord is against them that do evil. 13 And who is he that will harm you, if ye be followers of that which is good?