‘Ali said "Prophet of God I will be your minister in this mission.
‘Ali said "Prophet of God I will be your minister in this mission." He held my neck and said: "This is my brother my executor and my successor among you. Listen to him and obey him." The group laughed saying to Abu Talib: "He commanded you to listen to your son and to obey him!".
Al-Tabari recorded this hadith in his history (part 2 page 216) Ibn Al-Athir in his history Al-Kamil (part 2 page 41) recorded this hadith and so did Abu Al-Fida in his history (part 1 page 116) Al-Khazin Ala-o-Deen AI-Baghdadi in his commentary on the Holy Qur'an (page 390) and Al-Suyuti in his book Jami-Al-Jawami-a (part 7 page 392) where he mentioned it in reliance on Al-Tabari.
In the same part (page 397) he reported that all the six reliable recorders of the hadith (Ibn Is-Haq Ibn Jareer Ibn Abu Hashim Ibn Mardawaih Abu Na-eem and Al-Baihaqi) reported this hadith in their books. Ibn Abu Al-Hadid in his commentary on Nahiul-Balagha (volume 3 page 254) also recorded this hadith and Muhammad Hussein Haikal also recorded it in his book Hayaat Muhammad first edition (page 104). [^1] I have already discussed in the fifth chapter the significance of this declaration.
What I want to mention now is that this declaration indicates that the Messenger was looking through the light of God at the future which was stored for the blessed Message of Islam of diffusion throughout the world. He was also expecting the birth of a state built on its principles and that the carrier of this message who would be the leader of a nation will need a deputy that represents him and succeeds him and that that deputy ought to be obeyed as the man of Message ought to be obeyed.
Therefore he said to the group: "Listen to him and obey him." Thus the deputy has an authority similar to the authority of his leader. Some scholars say that this hadith indicates only that ‘Ali is the successor of the Holy Prophet among the children of Abdul-Muttalib. It does not indicate that he is the successor of the Prophet for all the Muslims. This argument is unsound.
The caliphate cannot be partitioned so the Messenger would have two caliphs: One for the Hashimites and one for the rest of the Muslims. The caliph has to be for all the Muslims because the Messenger is the head of all the Muslims and so is his caliph. The Muslims in regard to the caliphate are two factions: One says that the Messenger did not appoint a successor; the other says that he appointed ‘Ali lbn Abu Talib.