The Messenger of Allah (ص) said:
"Whoever is happy to live like me, and to die like me, and to take a place in the Garden of Eden, where my Lord has planted the trees, must support Ali after me and be a supporter of his followers, and follow the Imams after me; since they are my offspring, created from my spirit and intellect and knowledge have been made their sustenance. "So woe to those of my Ummah who deny their superiority and sever the sanctity of my kinship with them, for Allah will not grant my intercession"
Abu Na'im Esfahani, Hilyatul Auliya V.1, p. 86; Ibn Asaker, Tarikh Madinah-Damishq, V.42, page 240; Muttaqi Hindi, Kanz al-Ummal, V.12, page 103-104; Qunduzi, Yanabi al-Muwadda, V.1, page 379-380; V.2, page 489; And others like Fara’id as-Simtain, Kifayatu’t-Talib, Musnad Ahmad, Manaqib Ali (a.s.) etc.
Refer to our other book named “Aman al-Ummah min al-zelal wal- Ikhtelaf” (page 177) and similar to this has been narrated in Kanz al-Ummal (Muttaqi Hindi, V.11, p.611-612).