1 Corinthians 10:28

28But if someone says to you, “This has been offered in sacrifice,” then do not eat it, for the sake of the one who informed you, and for the sake of conscience

Titus 1:15

15 aTo the pure, all things are pure, but to the defiled and bunbelieving, nothing is pure; but both ctheir minds and their consciences are defiled.
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