Prophet Muhammed (saws) on Imam Ali (as)

The Prophet (P.B.U.H) said, “There is a tree in Paradise called Tuba. Its roots are in the house of Ali, and its branch is Ali (A.S).” Mustadrak Al-Sahihain of Al-Hakim Al-Nisabori, 3/109; Musnad Ahmad, 4/370; Al-Khasa’is of Al-Nisa’i, 25; Al-Tirmidhi; Al-Tabarani.