Joshua 23:6-8

6“Be very resolute to keep and to do all that is written in the book of the Torah of Moses, so that you may not turn aside from it to the right or to the left,

7and not intermingle with these nations who are still remaining among you. Do not mention the names of their gods or swear by them or worship them or bow down to them.

8But cling to Adonai your God, as you have done to this day.