Ephesians 5:7
Be not ye therefore partakers with them.
Cross-reference
Ephesians 5:11 expands the command: not only avoid partnership but actively expose the fruitless deeds of darkness.
Numbers 16:26 commands separation from Korah's rebellion — an OT example of avoiding partnership with the disobedient to escape judgment.
Psalm 50:18 condemns those who 'cast your lot with' sinners — the same warning against partnership with the disobedient.
Proverbs 1:10-17 warns not to consent when sinners entice — closely parallels the command not to become partners with them.
Proverbs 13:20 warns that a companion of fools suffers harm — directly supports the command to avoid partnership with the disobedient.
1 Timothy 5:22 says 'do not share in others' sins' — a direct parallel to avoiding partnership with the disobedient.
Revelation 18:4 calls believers to 'come out of her' to avoid sharing in her plagues — same separation from sinners to escape wrath.
Numbers 16:21 shows God commanding separation from rebels to avoid judgment — a parallel to Paul's warning against partnership.
Philippians 2:15 calls believers to be blameless among a crooked generation — a parallel to not partnering with the disobedient.