It was narrated that Hubshi bin Junadah said:
"I heard the Messenger of Allah say: ''Ali is part of me and I am part of him, and no one will represent me except 'Ali.'" (JA)
English reference (JA): Vol. 1, Book 1, Hadith 119 (JA)
Arabic reference (JA): Book 1, Hadith 124 (JA)