Joshua 23:6-9

Therefore, be very strong to keep and to do all that is written in the Book of the Law of Moses, turning aside from it neither to the right hand nor to the left, that you may not mix with these nations remaining among you or make mention of the names of their gods or swear by them or serve them or bow down to them, but you shall cling to the LORD your God just as you have done to this day. For the LORD has driven out before you great and strong nations. And as for you, no man has been able to stand before you to this day.