Numbers 33:55 in the King James Version
But if ye will not drive out the inhabitants of the land from before you; then it shall come to pass, that those which ye let remain of them shall be pricks in your eyes, and thorns in your sides, and shall vex you in the land wherein ye dwell.
Context
54 You shall inherit the land by lot according to your families; to the larger groups you shall give a larger inheritance, and to the smaller you shall give a smaller inheritance. Wherever the lot falls to any man, that shall be his. You shall inherit according to the tribes of your fathers.
55 “But if you do not drive out the inhabitants of the land from before you, then those you let remain of them will be like pricks in your eyes and thorns in your sides. They will harass you in the land in which you dwell.
56 It shall happen that as I thought to do to them, so I will do to you.”