Isaiah 11:13 speaks of Judah and Joseph (the Ten Tribes) being somewhat antagonistic towards each other until the End times when they will re-unite. Each one has their own destiny to fulfill. They should help each other and not the opposite. Each has their own separate task that they need to do before anything else.
See:
Ephraim and Judah (Isaiah 11:13).
The Way BACK is Through Self-Realization
http://hebrewnations.com/articles/
bible/isaiah/self.html