The Quran places great emphasis on the importance of blood relationships/near relatives. There are many verses on the obligations of kinship and the families of the Prophet in the Quran. It says that God has chosen the descendants of Adam, Noha Abraham and Israel above the people (19:58), in another verse God says that He bestowed upon them (Chosen Family) Imamate after being tested with certain commandments (2:124). Every Prophet of his age always appointed a wasi (successor) to carry the Divine message, to interpret the law (Sharia) to warn people and to remind of their duties to God.
via Ghadeer-e Khum- The Declaration of Imamat | Nooru’s Blog.
Ismailimail 