Exodus 23:27-30

I will send My terror ahead of you, and throw into confusion all the people among whom you come, and I will make all your enemies turn their backs to you. I will send hornets ahead of you so that they will drive out the Hivites, the Canaanites, and the Hittites before you. I will not drive them out before you in a single year, that the land may not become desolate and the beasts of the field become too numerous for you. I will drive them out before you little by little, until you become fruitful and take possession of the land.