1 Corinthians 8:7; 1 Corinthians 8:10-12

7 However not all men have this knowledge; but some, being accustomed to the idol until now, eat food as if it were sacrificed to an idol; and their conscience being weak is defiled.

10 For if someone sees you, who have knowledge, dining in an idol's temple, will not his conscience, if he is weak, be strengthened to eat things sacrificed to idols?

11 For through your knowledge he who is weak is ruined, the brother for whose sake Christ died.

12 And so, by sinning against the brethren and wounding their conscience when it is weak, you sin against Christ.