Romans 14:5-6

5 1One person esteems one day as better than another, while another esteems all days alike. 2Each one should be fully convinced in his own mind.
6 The one who observes the day, observes it in honor of the Lord. The one who eats, eats in honor of the Lord, since 3he gives thanks to God, while the one who abstains, abstains in honor of the Lord and gives thanks to God.