Who are you to judge the servant of another? To his own master he stands or falls; and stand he will, for the Lord is able to make him stand. One man regards one day above another, another regards every day alike.
Let each man be fully convinced in his own mind. He who observes the day, observes it for the Lord, and he who eats, does so for the Lord, for he gives thanks to God; and he who eats not, for the Lord he does not eat, and gives thanks to God. For not one of us lives for himself, and not one dies for himself; for if we live, we live for the Lord, or if we die, we die for the Lord; therefore whether we live or die, we are the Lord's."
Romans 14:1-8