هذا (علیٌّ) اَخی وَ وَصِیّی وَ خلیفَتی مِن بَعدی فَاسمَعموا لَهُ و أَطیعوا.
The Prophet of Islam (PBUH): This (Ali) is my brother and successor and the caliph after me. Listen to his command and obey him.
History of Tabari, vol. 1, p.331
source : erfan.ir
