we have to send lanats on some figures in Islam or enemies of Islam if a figure like Imam Ali as forgave his enemies or figures like Imam Hussein (as)

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There is no obligation requiring us to curse anyone, in fact, it is not allowed unless warranted by Allah, which He mentions in the holy Quran. What we are required to do is dissociate from them. This applies specifically to the enemies of Ahl Al-Bayt and those who usurped their rights. Moreover, there is no indication that our Imams forgave them.