He said: Abu Bakr Muhammad b. Umar b. Salim reported to me from Ali b. Ismail Abul Hasan al-Atrush, who reported from Muhammad b. Khalaf al-Muqri, who reported from Husain al-Ashqar, who reported from Qais b. al-Rabi', who reported from his father, from Abdul Rehman b. Abi Layla, from al-Husain b. ALI B.ABI TALIB (ASWS), that:
The PROPHET (SAWW), peace be upon him and his progeny, (once) said: "O Anas! Send for the master of Arabs to come to me." He said: "O MESSENGER of ALLAH (SWT), are you not the master of Arabs?"
He said: "I am the master of all children of Adam, and ALI (ASWS) is the master of Arabs." So, he sent for Ali (ASWS) and when he arrived, the PROPHET (SAWW) said: "Ask the Ansar (the helpers) to assemble."
When they arrived, the PROPHET (SAWW), peace be upon him and his progeny, said: "O people of Ansar, this is ALI (ASWS) , the master of Arabs, love him for the sake of my love, and honour him for the sake of my honour. Surely, what I tell you is exactly what Jibraeel has revealed to me from ALLAH (SWT), Most High."
(Ref: Al-Amali Shaikh Mufeed: The Sixth Assembly : Hadees No. 4)