Moreover, it shall come to pass,.... This being the case, they suffering the Canaanites to dwell among them, and they mingling with them, learning their works, and serving their gods: that

I shall do unto you as I thought I should do unto them; deliver them up into the hands of their enemies, who should carry them captive into other lands.

Next: Numbers Chapter 34

But if ye will not drive out the inhabitants of the land from before you--No associations were to be formed with the inhabitants; otherwise, "if ye let remain, they will be pricks in your eyes, and thorns in your sides"--that is, they would prove troublesome and dangerous neighbors, enticing to idolatry, and consequently depriving you of the divine favor and blessing. The neglect of the counsel against union with the idolatrous inhabitants became fatal to them. This earnest admonition given to the Israelites in their peculiar circumstances conveys a salutary lesson to us to allow no lurking habits of sin to remain in us. That spiritual enemy must be eradicated from our nature; otherwise it will be ruinous to our present peace and future salvation.

Next: Numbers Chapter 34