“Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:”
In other words Paul is saying dont let people judge you because of what you eat or drink or in regard to the observance of annual holy days, New Moon Festivals, or weekly worship days.
The key to Paul being able to say this is found in verse 10 – “…and ye are complete in Him (Christ)…”
All of the ceremonial law was fulfilled in Christ. Those things were a shadow of Christ. Christ came, died, and rose again and now we are complete in Him, because He completed EVERYTHING. We don’t worship Him through rituals, particular meats, or on specific days. No, He lives in us, we are His tabernacle and are to offer up worship, sacrifice and praise everyday!
Don’t fall under the ordinances (ceremonially) of man when it comes to worshipping God. Worship Him directly. We don’t worship through shadows anymore we worship the “Body which is Christ” (v.17)!!!