Joshua 23:12-13

12Else if ye do in any wise go back, and cleave unto the remnant of these nations, even these that remain among you, and make marriages with them, and go in unto them, and they to you:

13know for a certainty that the LORD your God will no more drive these nations from out of your sight; but they shall be a snare and a trap unto you, and a scourge in your sides, and thorns in your eyes, until ye perish from off this good land which the LORD your God hath given you.