Joshua 17:17-18

17Then Joshua said to the descendants of Joseph, ⌞the tribes of⌟ Ephraim and Manasseh, “You are an important and very powerful people. One region is really not enough for you.

18The mountain region will be yours as well. It is a forest, so you will have to clear it. All of it will be yours. But you must force out the Canaanites, even though they are strong and have chariots made of iron.”