Joshua 23:9

“Therefore be very courageous to keep and to do all that is written in the book of the law of Moses, that you not turn away from it to the right hand or to the left;

that you not come among these nations, these that remain among you; neither make mention of the name of their gods, nor cause to swear by them, neither serve them, nor bow down yourselves to them;

but hold fast to the LORD your God, as you have done to this day.

One man of you shall chase a thousand; for it is the LORD your God who fights for you, as he spoke to you.

Take good heed therefore to yourselves, that you love the LORD your God.

“But if you do at all go back, and hold fast to the remnant of these nations, even these who remain among you, and make marriages with them, and go in to them, and they to you;