Augustine of Hippo

At that time many people who were strong in their faith and who knew the Lord's teaching, that it is what comes out of the mouth which defiles a man, not what goes into it, were eating whatever they liked with a clear conscience. But some weaker ones abstained from meat and wine, so as to avoid unknowingly eating foods which had been sacrificed to idols. At that time the Gentiles sold all sacrificed meat in the butcher shops, poured out the first fruits of the wine as a libation to their idols and even made some offerings in the wine presses.