Galatians 4:10-11

4:10 You are observing religious ¹  days and months and seasons and years. 4:11 I fear for you that my work for you may have been in vain.

¹ tn The adjective “religious” has been supplied in the translation to make clear that the problem concerns observing certain days, etc. in a religious sense (cf. NIV, NRSV “special days”). In light of the polemic in this letter against the Judaizers (those who tried to force observance of the Mosaic law on Gentile converts to Christianity) this may well be a reference to the observance of Jewish Sabbaths, feasts, and other religious days.