Umm Salma (r.a.) narrates: The Messenger of Allah (s.a.w.a.) was in my house when Fatima (s.a.) entered with Ali bin Abi Talib (a.s.) behind her.
The Prophet informed Ali bin Abi Talib (a.s.) – O Ali! Rejoice because you and your companions will be in Paradise. O Ali! Rejoice because you and your Shias will be in Paradise. Bashaarah al-Mustafa Le Shiah al-Murtaza v 2 p 153