It is worth mentioning that Bukhari has narrated this tradition from Uthman bin Ghiyath who has narrated it from Abu Usama (Hammad bin Usama).
Hadithi hii pia ameitaja Hafidhi Bin Asaakir katika habari ya maisha ya Ali (a.s.) katika kitabu chake cha Taareekhul-Kabeer.