Lest they teach you to do all the abominations which they have done to their gods: and you should sin against the Lord your God.

so that they teach you not to do according to all their abominations which they have done to their gods, and ye have sinned against Jehovah your God.

So that you may not take them as your example and do all the disgusting things which they do in the worship of their gods, so sinning against the Lord your God.

Otherwise, they may teach you to do all the abominations which they have committed for their own gods. And then you would sin against the Lord your God.

Ne doceant vos facere secundum abominationes suas quas faciunt diis suis: et peccetis in Jehovam Deum vestrum.

That they teach you not to do after all their abominations,.... This is another reason why they were to be utterly destroyed, not only because of the abominations which they committed, but to prevent the Israelites being taught by them to do the same; wherefore, as before observed from Jarchi, such as became proselytes were suffered to live among them, because there was no danger of idolatry from them, which even proselytes of the gate renounced; and though all other abominations are included, yet this is particularly respected, as appears from the following clause:
which they have done unto their gods; to the honour of whom not only many superstitious rites and ceremonies were performed, and idolatrous actions committed, but acts of lewdness, and even unnatural uncleanness:
so should ye sin against the Lord your God; a sin the most provoking to him, as the sin of idolatry was; and cause his anger to rise to such a degree, as to suffer them to be carried captive from the land he gave them to inherit; and which afterwards, was the case, and that through learning the manners and customs of these people; see Psalm 106:34.