1 Corinthians 8:7

7ButἈλλ’notοὐκinἐνall [is]πᾶσινthisἡknowledgeγνῶσις·Someτινὲςnowδὲτῇby habitσυνηθείᾳuntilἕωςnowἄρτιof theτοῦidolεἰδώλουas ofὡςa thing sacrificed to an idolεἰδωλόθυτονeatἐσθίουσιν,andκαὶtheἡconscienceσυνείδησιςof themαὐτῶνweakἀσθενὴςbeingοὖσαit is defiledμολύνεται.

But the knowledge [is] not in all. And some, by habit of the idol until now, eat [such] as a thing sacrificed to an idol; and their conscience being weak, it is defiled.