The Departure of Musa عليه السلام and the Occurrence of Occultation Among His Successors

And thus will be the path of the Qa'im. He possesses knowledge, and when the time of his emergence arrives, that knowledge will emanate from within him. Allah, Exalted, will cause him to speak, and he will be called out: "Arise, O friend of Allah, and slay the enemies of Allah." He has a sheathed sword, and when the time of his rise comes, the sword will be unsheathed, and Allah will cause it to speak. It will call: "Arise, O friend of Allah, it is not lawful for you to remain seated while the enemies of Allah exist." So he will rise and slay the enemies of Allah wherever they are found, establish the limits of Allah, and rule by the judgment of Allah, Mighty and Exalted.
And this was narrated o me by Abu al-Hasan Ahmad b. Thabit al-Dawalini in Madinat al-Salam, from Muhammad b. al-Fadl al-Nahwi, from Muhammad b. Ali b. Abd al-Samad al-Kufi, from Ali b. Asim, from Muhammad b. Ali b. Musa, from his father, from his forefathers, from al-Husayn b. Ali (peace be upon them), from the Messenger of Allah صلى الله عليه وعلى آله وسلم, in a long narration — which I have cited in this book in the chapter concerning what has been narrated from the Prophet صلى الله عليه وعلى آله وسلم regarding the designation of the Qa'im عليه السلام, and that he is the twelfth of the Imams (peace be upon them).