Judges 2:19-23

But it came about, when the judge died, that they would turn back and act more corruptly than their fathers, in following other gods to serve them and bow down to them; they did not abandon their practices or their obstinate ways.

So the anger of the Lord burned against Israel, and He said, “Because this nation has violated My covenant which I commanded their fathers, and has not listened to My voice,

I in turn will no longer drive out from them any of the nations which Joshua left when he died,

in order to test Israel by them, whether they will keep the way of the Lord to walk in it as their fathers did, or not.”

So the Lord allowed those nations to remain, not driving them out quickly; and He did not hand them over to Joshua.