29 I will not drive them out from before thee in one year; lest the land should become desolate, and the beast of the field should multiply against thee.
Exodus 23:29 Cross References - Webster
Deuteronomy 7:22
22 And the LORD thy God will drive out those nations before thee by little and little: thou mayest not consume them at once, lest the beasts of the field increase upon thee.
Judges 3:1-4
1 Now these are the nations which the LORD left, to prove Israel by them, (even as many of Israel as had not known all the wars of Canaan;
2 Only that the generations of the children of Israel might know to teach them war, at the least such as before knew nothing of it;)
3 Namely, five lords of the Philistines, and all the Canaanites, and the Sidonians, and the Hivites that dwelt on mount Lebanon, from mount Baal-hermon to the entrance of Hamath.
4 And they were to prove Israel by them, to know whether they would hearken to the commandments of the LORD, which he commanded their fathers by the hand of Moses.