Jabir b. Abdullah Ansari narrates that he read the following in the tablet of Hazrat Fatimah Zahra (s.a.) regarding Imam Mahdi (a.t.f.s.), ‘…(Soon) through him I shall manifest Hasan, who will call towards My path and be the treasurer of My knowledge. Then I shall complete this chain through his son م ح م د , the mercy for the universe.’
Faraaed al-Simtain chap 2 pg 137