Romans 14:4-6

4Who are you to judge someone else’s servant? To their own master, servants stand or fall. And they will stand, for the Lord is able to make them stand. 5One person considers one day more sacred than another; another considers every day alike. Each of them should be fully convinced in their own mind. 6Whoever regards one day as special does so to the Lord. Whoever eats meat does so to the Lord, for they give thanks to God; and whoever abstains does so to the Lord and gives thanks to God.