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Shiavault - a Vault of Shia Islamic Books Hayat Al-Qulub Vol. 2 Bequests of the Messenger of Allah (S) and incidents that occurred at the time of his death Shaykh Tabarsi has narrated that when the Holy Prophet (S) returned from the Farewell Hajj he was informed that his end was near. So he used to regularly sermonize the people and restrain them from the mischiefs that were to follow his death. And he used to exhort them not to disobey his instructions.
He used to emphasize that they don’t abandon his Sunnah and that they don’t create innovations in the religion of Allah. They should remain attached to his progeny and his Ahlul Bayt (a.s.), and consider their obedience, help, protection and following obligatory on themselves. The Prophet used to warn to him against apostasy and about falling into disputes. He used to regularly tell them: O people I am going before you and you will meet me at Hauze Kauthar.
Then I will ask you how you dealt with those two important things that I left among you; which is the Book of Allah and my progeny and Ahlul Bayt (a.s.). Therefore, you should mind how you behave with them. Doubtlessly, the Kind and the Informed Lord has informed me that these two will not separate till they reach me at Hauze Kauthar.
Doubtlessly, I am leaving these two among you, therefore, you must not precede my Ahlul Bayt (a.s.) in any matter and do not separate from them; do not fall short in fulfillment of their rights, or you would be destroyed. And don’t teach them anything as they are more learned than you. I should not find you turning away from religion and to turn apostates and pull out swords against each others. After which you meet me on the battlefield against me and Ali.
You should know that Ali is my brother and successor. He will fight for the interpretation of Qur’an just as I have fought for its revelation. Thus the Holy Prophet (S) stressed these points in various gatherings. Then he formed an army of hypocrites and mischief-makers and placed it under the command of Usamah bin Zaid and ordered him to take the companions and march to Rum to the place where his father had been martyred.
And the reason of sending that army was to assure that Medina is cleared of hypocrites and mischief-makers. And that no one should dispute with Amirul Momineen (a.s.) so that the matter of Caliphate is decided in his favor. Thus Usamah was sent upto Jarf and ordered to camp there till the forces gather around him.