12 Be careful not to make a treaty with those who live in the land where you are going, or they will be a snare among you. 13 Break down their altars, smash their sacred stones and cut down their Asherah poles.[1] 14 Do not worship any other god, for the Lord, whose name is Jealous, is a jealous God. 15 "Be careful not to make a treaty with those who live in the land; for when they prostitute themselves to their gods and sacrifice to them, they will invite you and you will eat their sacrifices. 16 And when you choose some of their daughters as wives for your sons and those daughters prostitute themselves to their gods, they will lead your sons to do the same.

Matthew Henry's Commentary on Exodus 34:12-16

Commentary on Exodus 34:10-17

(Read Exodus 34:10-17)

The Israelites are commanded to destroy every monument of idolatry, however curious or costly; to refuse all alliance, friendship, or marriage with idolaters, and all idolatrous feasts; and they were reminded not with idolaters, and all idolatrous feats; and they were reminded not to repeat the crime of making molten images. Jealously is called the rage of a man, Proverbs 6:34; but in God it is holy and just displeasure. Those cannot worship God aright, who do not worship him only.

3 Do not intermarry with them. Do not give your daughters to their sons or take their daughters for your sons,

Matthew Henry's Commentary on Deuteronomy 7:3

Commentary on Deuteronomy 7:1-11

(Read Deuteronomy 7:1-11)

Here is a strict caution against all friendship and fellowship with idols and idolaters. Those who are in communion with God, must have no communication with the unfruitful works of darkness. Limiting the orders to destroy, to the nations here mentioned, plainly shows that after ages were not to draw this into a precedent. A proper understanding of the evil of sin, and of the mystery of a crucified Saviour, will enable us to perceive the justice of God in all his punishments, temporal and eternal. We must deal decidedly with our lusts that war against our souls; let us not show them any mercy, but mortify, and crucify, and utterly destroy them. Thousands in the world that now is, have been undone by ungodly marriages; for there is more likelihood that the good will be perverted, than that the bad will be converted. Those who, in choosing yoke-fellows, keep not within the bounds of a profession of religion, cannot promise themselves helps meet for them.