Formerly, when you did not know God, you were enslaved to beings that by nature are not gods.
Now, however, that you have come to know God, or rather to be known by God, how can you turn back again to the weak and beggarly elemental spirits? How can you want to be enslaved to them again?
References for Galatians 4:9
You are observing special days, and months, and seasons, and years.
I am afraid that my work for you may have been wasted.