Bismillah Arrahman Arraheem
As-salamu alaikum wa Rahmatullahi wa Barakatoh,
The first who cursed the killers of Husain bin Ali (alayhi salām) was Ibrahim (alayhi salām), Friend of Allah. He ordered his children to curse them and took a covenant from them about it. After Ibrahim (alayhi salām), Musa Ibne Imran (alayhi salām) cursed the killers of Husain (alayhi salām) and ordered his Ummah to do so. Dawood (alayhi salām) also cursed them and ordered Bani Israel to do so. Then Isa (alayhi salām) cursed them and often used to say, “O Bani Israel! Curse the killers of Husain (alayhi salām), and if you meet Husain (alayhi salām) support him. Those who are martyred with Husain (alayhi salām) are like those martyred with all the prophets who confronted their enemies and did not flee from them. It is as if I can see his place of martyrdom. There is no Prophet who has not visited Kerbala and stood there and said: “Indeed you are a blessed land. The luminous moon and the brilliant effulgence will be buried in you.”