What is the ruling on the one who rejects The Imam?

Whoever rejects the call of the rightful Imam of guidance in their time and place—after the truth of his call has reached them clearly and without any valid doubt—out of denial, arrogance, or stubborn opposition, then such a person falls under the warning mentioned by Imam al-Hādī ilā al-Ḥaqq (peace be upon him):

“Whoever hears the call of our household (Ahl al-Bayt) and does not respond to it, Allah will throw him face-down into the Fire of Hell.”