1. these are the nations which the Lord left, to prove Israel—This was the special design of these nations being left, and it evinces the direct influence of the theocracy under which the Israelites were placed. These nations were left for a double purpose: in the first instance, to be instrumental, by their inroads, in promoting the moral and spiritual discipline of the Israelites; and also to subserve the design of making them acquainted with war, in order that the young, more especially, who were total strangers to it, might learn the use of weapons and the art of wielding them.

     Jud 3:5-7. BY COMMUNION WITH THESE THE ISRAELITES COMMIT IDOLATRY.