Joshua 23:8-13

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. One man of you puts to flight a thousand, since it is the LORD your God who fights for you, just as he promised you. Be very careful, therefore, to love the LORD your God. For if you turn back and cling to the remnant of these nations remaining among you and make marriages with them, so that you associate with them and they with you, know for certain that the LORD your God will no longer drive out these nations before you, but they shall be a snare and a trap for you, a whip on your sides and thorns in your eyes, until you perish from off this good ground that the LORD your God has given you.