John Gill

But were mingled among the Heathen,.... Not only dwelt among them, but made covenants and contracts, carried on trade and commerce, and intermarried with them, contrary to the express law of God, Deu 7:2. Nor should saints have communion with wicked men, especially in things sinful and superstitious, Co2 6:14. And learned their works; not their civil works and actions, their trades and business, but their idolatrous works; of which a detail is given in the following verses: "evil communications corrupt good manners", Co1 15:33.