Exodus 23:28-30

Sending out hornets before, that shall drive away the Hevite, and the Chanaanite, and the Hethite, before thou come in. I will not cast them out from thy face in one year: lest the land be brought into a wilderness, and the beasts multiply against thee. By little and little I will drive them out from before thee: till thou be increased, and dost possess the land.