II. How wickedly Israel mingled themselves with those that did remain. One thing God intended in leaving them among them was to prove Israel (v. 4), that those who were faithful to the God of Israel might have the honour of resisting the Canaanites' allurements to idolatry, and that those who were false and insincere might be discovered, and might fall under the shame of yielding to those allurements. Thus in the Christian churches there must needs be heresies, that those who are perfect may be made manifest, 1 Cor. xi. 19. Israel, upon trial, proved bad. 1. They joined in marriage with the Canaanites (v. 6), though they could not advance either their honour or their estate by marrying with them. They would mar their blood instead of mending it, and sink their estates instead of raising them, by such marriages. 2. Thus they were brought to join in worship with them; they served their gods (v. 6), Baalim and the groves (v. 7), that is, the images that were worshipped in groves of thick trees, which were a sort of natural temples. In such unequal matches there is more reason to fear that the bad will corrupt the good than to hope that the good will reform the bad, as there is in laying two pears together, the one rotten and the other sound. When they inclined to worship other gods they forgot the Lord their God. In complaisance to their new relations, they talked of nothing by Baalim and the groves, so that by degrees they lost the remembrance of the true God, and forgot there was such a Being, and what obligations they lay under to him. In nothing is the corrupt memory of man more treacherous than in this, that it is apt to forget God; because out of sight, he is out of mind; and here begins all the wickedness that is in the world: they have perverted their way, for they have forgotten the Lord their God.