Imam Muhammad Baqir (a.s.) narrates – The Messenger of Allah (s.a.w.a.) said to Ali b. Abi Talib (a.s.) Should I give you glad tidings?
Ali (a.s) said – Yes, O Messenger of Allah.
The Prophet (s.a.w.a.) said – You and I were created from the same clay, and our Shia were created from the remainder of the clay leftover from our creation. So on the Day of Judgement, people will be called with the name of their mothers except your Shia. Your Shia will be called with the name of their fathers because they were conceived legitimately.
Behaar al-Anwaar v 67 p 126 Al-Amaali v 1 p 71, 77 Bashaarah al-Mustafa Le Shiah al-Murtaza trad 20