1CO 8:7

7 Nevertheless, some people do not understand [that idols are not really alive]. In the past, some among you who are believers now were accustomed to believing that idols [were really alive]. As a result, when they eat such meat [now], they still think that it was sacrificed to an idol [that is alive]. They are not sure [that God allows believers to eat meat that has been offered to idols]. So, [when they eat such meat], they think that they have sinned.