Judges 2:6

The beginning of this paragraph is only a repetition of what account we had before of the people's good character during the government of Joshua, and of his death and burial (Jos 24:29, Jos 24:30), which comes in here again only to make way for the following account, which this chapter gives, of their degeneracy and apostasy. The angel had foretold that the Canaanites and their idols would be a snare to Israel; now the historian undertakes to show that they were so, and, that this may appear the more clear, he looks back a little, and takes notice, 1. Of their happy settlement in the land of Canaan. Joshua, having distributed this land among them, dismissed them to the quiet and comfortable possession of it (Jdg 2:6): He sent them away, not only every tribe, but every man to his inheritance, no doubt giving them his blessing. 2. Of their continuance in the faith and fear of God's holy name as long as Joshua lived, Jdg 2:7.

— Matthew Henry's Concise Commentary (public domain)

And when Joshua had let the people go--This passage is a repetition of Jos 24:29-31. It was inserted here to give the reader the reasons which called forth so strong and severe a rebuke from the angel of the Lord. During the lifetime of the first occupiers, who retained a vivid recollection of all the miracles and judgments which they had witnessed in Egypt and the desert, the national character stood high for faith and piety. But, in course of time, a new race arose who were strangers to all the hallowed and solemnizing experience of their fathers, and too readily yielded to the corrupting influences of the idolatry that surrounded them.

— Jamieson-Fausset-Brown Commentary (public domain)