Judges 3:4 WEB

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], the five lords of the Philistines, and all the Canaanites, and the Sidonians, and the Hivites who lived on Mount Lebanon, from Mount Baal Hermon to the entrance of Hamath.

⁴  They were [left], to prove Israel by them, to know whether they would listen to the commandments of Yahweh, which he commanded their fathers by Moses.

⁵  The children of Israel lived among the Canaanites, the Hittites, and the Amorites, and the Perizzites, and the Hivites, and the Jebusites:

⁶  and they took their daughters to be their wives, and gave their own daughters to their sons and served their gods.