Romans 14:6

6The one who observes the day, observes it in honor of the Lord. The one who eats, eats in honor of the Lord, since ahe gives thanks to God, while the one who abstains, abstains in honor of the Lord and gives thanks to God.

Titus 1:15

15 bTo the pure, all things are pure, but to the defiled and cunbelieving, nothing is pure; but both dtheir minds and their consciences are defiled.
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