Imam's Tatbeer
Question :

Did any of the Imams (peace be upon them) perform the mourning rites with the shedding of blood?

Answer :

The narrations do not mention that the Imams (peace be upon them) shed their own blood because of their sadness and grief for what happened to Imam Hussein (peace be upon him). However, it was reported that they wept and that they encouraged crying loudly, like the supplication of Imam Jaffer Al-Sadiq (peace be upon him): "my Lord, have mercy on the wailing that is raised for us." It is also reported in Ziyarah al-Nahiyah which is narrated from Imam Mahdi (may Allah hasten his reappearance): "I will mourn you day and night, I will weep for you blood instead of tears, in grief for you". Such narrations and others indicate the greatness of this tragedy.