And the LORD your God will drive out those nations before you little by little; you will be unable to destroy them at once, lest the beasts of the field become too numerous for you.
Deuteronomy 7:22
Surrounding context
7:21 You shall not be terrified of them; for the LORD your God, the great and awesome God, is among you.
7:22 And the LORD your God will drive out those nations before you little by little; you will be unable to destroy them at once, lest the beasts of the field become too numerous for you.
7:23 But the LORD your God will deliver them over to you, and will inflict defeat upon them until they are destroyed.