Galatians 4:8-11

8Howbeit then, when ye knew not God, ye did service unto them which by nature are no gods. 9But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage? 10Ye observe days, and months, and times, and years. 11I am afraid of you, lest I have bestowed upon you labour in vain. (KJV)