1 Corinthians 8:7, 10

Howbeit there is not in all men that knowledge: but some, being used until now to the idol, eat as of a thing sacrificed to an idol; and their conscience being weak is defiled.

For if a man see thee who hast knowledge sitting at meat in an idol’s temple, will not his conscience, if he is weak, be emboldened to eat things sacrificed to idols?