Knowing the most knowledgeable scholar depends on ultimate induction of all scholars and full understanding of their knowledge, which is not possible except for God and therefore, knowing the most knowledgeable scholar is possible only by referring to God or to someone who reports from God; as the children of Israel referred to their prophet, and he introduced Talut as the most knowledgeable and said: ﴿إِنَّ اللَّهَ اصْطَفَاهُ عَلَيْكُمْ وَزَادَهُ بَسْطَةً فِي الْعِلْمِ وَالْجِسْمِ ۖ﴾[1]; “Indeed God has selected him for you and has extended his knowledge and physical strength”; especially considering that the most knowledgeable person among the scholars is God’s Caliph on earth, and he is not recognized except by a text from the prophet or a sign from God, rather the most knowledgeable of scholars after him also will be recognized only with the same way. In the meanwhile, if someone is really the most knowledgeable, he would be distinguishable from other scholars to the extent that, commonly, it would not be hidden from the wise people, similar to the moon among the stars; to the extent that when they look at him, they will be certain that he is more knowledgeable than other scholars; because his difference with them is as bright as morning dawn in the darkness.