Judges 3:1-2, 4-6

These are the nations the LORD left to test all those Israelites who had not experienced any of the wars in Canaan (he did this only to teach warfare to the descendants of the Israelites who had not had previous battle experience)

They were left to test the Israelites to see whether they would obey the LORD’s commands, which he had given their ancestors through Moses. The Israelites lived among the Canaanites, Hittites, Amorites, Perizzites, Hivites and Jebusites. They took their daughters in marriage and gave their own daughters to their sons, and served their gods.