Paul appeals to the Colossians to make a decisive break with the sinful tendencies that they have carried into their Christian lives.
5 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. 8 But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth. 9 Lie not one to another, seeing that ye have put off the old man with his deeds; 10 And have put on the new [man], which is renewed in knowledge after the image of him that created him: 11 Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond [nor] free: but Christ [is] all, and in all. (KJV; for other versions, see https://www.blueletterbible.org/)
5 Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry. “Mortify” means put to death. Because Christians have died with Christ (3:3), they should get completely rid of sinful practices. “Fornication” is any kind of sexual activity outside of marriage. The next three vices which Paul lists also have to do with sexual purity, stressing the importance of bringing this part of life under control. Paul also equates covetousness with idolatry in 1 Timothy 6:16, “The love of money is the root of all evil.” Similarly Jesus warned, “Lay not up for yourselves treasures upon earth, … For where your treasure is, there will your heart be also” (Matthew 6:19-21).
6 For which things’ sake the wrath of God cometh on the children of disobedience. “Cometh” is translated “is coming” in both the NIV and the ESV, and so “the wrath of God” may refer to the future day of the Lord described in Zephaniah 1:14-15. G. Preston MacLeod reflects on our difficulty in understanding God’s displaying such wrath, “How can a God of love express ‘wrath’? On the other hand, how can a God of righteousness condone sin?” He goes on to encourage us to think of God’s attitude to the sinner in terms of the relation of the loving father to the prodigal son. (Francis W. Beare and G. Preston MacLeod, “The Epistle to the Colossians” in The Interpreter’s Bible, Nashville, Tennessee: Abington Press, 1955, volume XI, page 214)
7 In the which ye also walked some time, when ye lived in them. Paul reminds the Colossians that they had been guilty of these vices before they accepted Christ into their lives. “Walked” points to outward conduct and “lived” to the attitudes and feelings from which that conduct flows.
8 But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth. Paul lists five more vices, all of which have a bearing on relationships among believers. Scholars disagree on the distinction between “anger” and “wrath,” some taking “anger” as a sudden flame of fury and “wrath” as the settled attitude, and others taking the opposite view. “Blasphemy” is translated “slander” in both the NIV and the ESV. The Greek for “filthy communication” may mean either obscene or abusive speech, and scholars are divided on its meaning here.
9 Lie not one to another, seeing that ye have put off the old man with his deeds; 10 And have put on the new [man], which is renewed in knowledge after the image of him that created him. The sin of lying’s being singled out for special mention emphasizes its condemnation. As a person takes off dirty clothes and puts on clean ones, Christians should abandon their evil ways (illustrated in verses 5 and 8-9) and practice the Christian virtues (illustrated in verses 12-14). Both the NIV and the ESV have “is being renewed” instead of “is renewed”, indicating that the transformation of Christians is an ongoing process. “Knowledge,” which is either the goal or the sphere of the renewing, denotes the knowledge of God’s will referred to in Colossians 1:9.
11 Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond [nor] free. “Neither Greek nor Jew, circumcision nor uncircumcision” asserts that there are no status distinctions among the God’s new covenant people; compare Galatians 3:28. “Barbarians” were ones who didn’t speak Greek and were considered uncivilized. “Scythians,” who were located along the northern coast of the Black Sea, were known for their brutality. Jesus, who “is all, and in all,” binds Christians together, regardless of their differences.