17:33 “….. And whoever is killed unjustly – We have given his heir authority, but let him not exceed limits in [the matter of] taking life. Indeed, he has been supported”
Exegesis: Imam Muhammad al-Baqir said: “Those killed unjustly (in the above verse) are Imam Husayn and his successors. When the Mahdi will appear he will account for their blood (We have given his heir authority, but let him not exceed limits in [the matter of] taking life. Indeed, he has been supported.). He will take revenge in such a way that some people will say that he has gone to the extreme.”