2:16,17 - "Therefore no one is to act as your judge in regard to food or drink or in respect to a festival or a new moon or a Sabbath day, things which are a mere shadow of what is to come; but the substance belongs to Christ."
Galatians 4:9-11 But now that you have come to know God, or rather to be known by God, how is it that you turn back again to the weak and worthless elemental things, to which you desire to be enslaved all over again?
(10) You observe days and months and seasons and years.
(11) I fear for you, that perhaps I have labored over you in vain.
I fear that we waste far too much time arguing over things which are a "mere shadow of what is to come" and pay far too little attention to Christ, Himself