Joshua 23:12-13

Or else, if indeed you do go back, and cling to the remnant of these nations—these that remain among you—and make marriages with them, and go in to them and they to you, know for certain that the LORD your God will no longer drive out these nations from before you. But they shall be snares and traps to you, and scourges on your sides and thorns in your eyes, until you perish from this good land which the LORD your God has given you.