Colossians 2:13 reveals believers were dead in trespasses but made alive, contrasting the former sinful walk described in 3:7.

Romans 6:19 uses the same contrast of past slavery to impurity versus present righteousness, reinforcing the former sinful lifestyle.

Romans 6:20 reminds that when slaves of sin they were free from righteousness, directly paralleling the former life without Christ.

Romans 7:5 describes living in the flesh with sinful passions bearing fruit for death, paralleling the former sinful living in Colossians 3:7.

In 1 Corinthians 6:11, Paul similarly reminds believers that such sinful behaviors characterized their past, but they have been washed and sanctified.

In Ephesians 2:2, Paul uses the exact phrase 'in which you once walked' to describe the former lifestyle under the world's influence.

In Titus 3:3, Paul recalls that believers themselves were once foolish and enslaved to passions, mirroring the former life in Colossians 3:7.

In 1 Peter 4:3, Peter lists similar vices (sensuality, passions, drunkenness) as the past behavior of the Gentiles, echoing the 'once walked' theme.

In Ephesians 4:22, Paul urges putting off the old self belonging to the former manner of life, directly echoing the 'once walked' concept in Colossians 3:7.

In Romans 11:30, Paul reminds Gentiles they were once disobedient but now have received mercy, paralleling the past sinful state in Colossians 3:7.

In 1 Peter 4:2, Peter contrasts living for human passions with living for God's will, reinforcing the transition from the former way of life in Colossians 3:7.

In 1 Peter 4:4, Peter describes the surprise of unbelievers when believers no longer join their debauchery, highlighting the change from the former walk.