The conclusion of the Twelver Shia school is that Muhammad left the world with the Quran and his "bayt" (household) as guides for humanity. Similar to the 12 tribes of bani Israel (Quran 2:60-61) and the 12 disciples of Jesus (Bible Revelation 21:14), Muhammad also left his community with 12 heirs to guide the community and protect the interpretation of the Quran. Of note, very few of God's chosen messengers and guides ever attained worldly power. As such, the concept of the twelve successors is not a prophecy of worldly leaders, but rather spiritual guides (imams) and the notion that these twelve must be worldly leaders to be successors of Muhammad is rejected. These twelve imams are not a monarchy, but rather are spiritual leaders in the line of Abraham as promised to him in the Quran 2:124: "And when his Lord tried Ibrahim with commands, he fulfilled them. He said: Surely I will make you an "Imam" for mankind. (Ibrahim) said: And of my offspring (will there be Imams)? He said, my covenant does not include the unjust."