Romans 14:5-6 New Revised Standard Version (NRSV)
5 Some judge one day to be better than another, while others judge all days to be alike. Let all be fully convinced in their own minds. 6 Those who observe the day, observe it in honor of the Lord. Also those who eat, eat in honor of the Lord, since they give thanks to God; while those who abstain, abstain in honor of the Lord and give thanks to God.