And they called the people unto the sacrifices of their gods: and the people did eat, and bowed down to their gods.

Wesley's Notes

25:2 They - The Moabites being now neighbours to the Israelites, and finding themselves unable to effect their design by war and witchcraft, fell another way to work, by contracting familiarity with them, and, perceiving their evil inclinations, they, that is, their daughters, invited them. Unto the sacrifices - Unto the feasts which were made of their parts of the sacrifices, after the manner of the Jews and Gentiles too, the participation whereof, was reckoned a participation in the worship of that God to whom the sacrifices were offered. Of their gods - Of their God, Baal - peor, the plural Elohim being here used, as commonly it is, for one God.

Matthew Henry's Concise Commentary

25:1-5 The friendship of the wicked is more dangerous than their enmity; for none can prevail against God's people if they are not overcome by their inbred lusts; nor can any enchantment hurt them, but the enticements of worldly interests and pleasures. Here is the sin of Israel, to which they are enticed by the daughters of Moab and Midian. Those are our worst enemies who draw us to sin, for that is the greatest mischief any man can do us. Israel's sin did that which all Balaam's enchantments could not do; it set God against them. Diseases are the fruits of God's anger, and the just punishments of prevailing sins; one infection follows the other. Ringleaders in sin ought to be made examples of justice.