Romanos 14

Each person should be fully convinced about observing special days, thinking and deciding for himself and not for others. We should try to please God by everything we do.

5 Some people regard certain days as holy and think that the other days are not holy. Other people regard all days as equally suitable for worshipping God. Each person should be fully convinced about such matters, thinking and deciding for himself and not for others. 6 As for those who believe that they should worship on a certain day of the week, it is to honor the Lord that they worship on that day. And as for those who think that it is all right to eat all kinds of food, it is to honor the Lord that they eat those foods, as is clear from their thanking God for the food that they eat. As for those who abstain from eating certain kinds of food, it is to honor the Lord that they do not eat those foods, and they also thank God for the food that they do eat. So doing either of those things is not wrong in itself.