'''Rein over the house of Jacob''' - Jacob and Israel are two names for the same guy. Jacob lost his inheritance when he forfeited all he possessed to Esau. Israel obtained the blessing and promise when Esau did not kill them all and gave them back. Jacob represents the national Israel and the flesh. Israel represents the true children of Abraham by faith. Jesus is the last king of national Israel (his reign is forever). Jesus is king over the flesh of the church, meaning that our flesh is ruled or 'trained in righteousness' by him.