the Tribe of Manasseh: Often at War with Ephraim
Source: TTT
Judges 12:1, 6
Then the men of Ephraim assembled and crossed the Jordan to Zaphon. They said to Jephthah, “Why have you crossed over to fight the Ammonites without calling us to go with you? We will burn your house down with you inside!” / they told him, “Please say Shibboleth.” If he said, “Sibboleth,” because he could not pronounce it correctly, they seized him and killed him at the fords of the Jordan. So at that time 42,000 Ephraimites were killed.
Isaiah 9:21
Manasseh devours Ephraim, and Ephraim Manasseh; together they turn against Judah. Despite all this, His anger is not turned away; His hand is still upraised.