Galatians 4:8 - 4:11
8 However at that time, when you did not know God, you were slaves to those which by nature are no gods. 9 But now, having known God, or rather having been known by God, how is it that you turn back again to the weak and worthless elemental things, to which you want 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 for nothing.