Cross reference
Deuteronomy 7:22
22 And the LORD thy God will put 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.
Exodus 23:29-30
29 I will not drive them out from before thee in one year; lest the land become desolate, and the beast of the field multiply against thee.
30 By little and little I will drive them out from before thee, until thou be increased, and inherit the land.
Joshua 15:63
63 As for the Jebusites the inhabitants of Jerusalem, the children of Judah could not drive them out; but the Jebusites dwell with the children of Judah at Jerusalem unto this day.