Colossians 2:16–17: Sabbath, Sunday, and Judgment
Colossians 2:16–17 forbids anyone from judging believers over feast days, new moons, or a Sabbath day, since those observances were a shadow pointing to Christ. The text removes the courtroom from the calendar question without making any day either a sin or a law.
Colossians 2:18–19: Is Angel Worship a Sin?
Colossians 2:18–19 names angel worship as one symptom of a deeper problem: a posture of self-abasement and speculation that lets go of Christ the Head. The passage's verdict rests on who Christ is, not on a standalone rule.