Joshua 23:12-13

12Else if ye do in any way go back, and follow after the remnant of these nations, even these that remain among you, and shall make marriages with them, and associate with them, and they with you: 13Know for a certainty that the LORD your God will no more drive out any of these nations from before you; but they shall be snares and traps to you, and scourges in your sides, and thorns in your eyes, until ye perish from off this good land which the LORD your God hath given you.