Isaiah 9:20-21

They even consume themselves to satisfy themselves. The tribes of Israel were consuming each other for the same purpose, even brother tribes like Ephraim and Manasseh that had come from one father, Joseph (cf. Judges 12:1-6). The Hebrews described the members of their own tribe or family as their "arm" because they supported and sustained them. Whereas Judah had defended his brothers in the days of the patriarchs (Genesis 44:18-34), now the descendants of Joseph were trying to destroy the descendants of Judah. For this reason God’s hand of judgment was still extended against Ephraim.