William Burkitt on 1 Corinthians 10:7

Our apostle being still dissuading the Corinthians from eating of things offered unto idols, and thereby from holding communion with the Gentiles in their idolatrous banquets in their idol-temples, he sets before them the idolatry of the Jews, who sat down to eat and to drink of the sacrifices offered to the golden calf, and rose up to play: that is, to dance before the golden calf, after the manner of the heathen, this being one of their rites by which they honoured their gods.

He farther advises them to take heed how they mix with idolaters in their feasts, lest they be given up to fornication, as the Israelites were in the wilderness with the daughters of Moab, Num 25:1-18 of whom there fell in one day three and twenty thousand by the immediate hand of God.

Learn hence, That Almighty God has left many instances upon record, in his holy ward, of the severity of his justice upon persons guilty of idolatry and fornication, and all other sins, on purpose to warn all of their sin and danger in the perpetration and commission of them. To sin against example is an aggravation of sin.