Some people told me that Imam al-Hussayn (as) was not « really » killed in kerbala, but God saved him exactly as he saved Jesus a.s from the cross, and he replaced him with an ennemy. Is that right ? The guy who told me this gave me a nussayri hadith. I want to know if we have this kind of version in imamiyyah school.

No such belief is held by our scholars. Those spreading this are exaggerating and are wrong