Is one who insults a prophet an apostate, or is it one of the matters in which a person may be excused due to ignorance?

Question:
He says: Honorable Shaykh, may Allah grant you success. Shaykh al-Islam Ibn Taymiyyah (may Allah have mercy on him) mentioned in his book al-Iqtida' that there is scholarly consensus that one who insults any of the prophets during his prophethood is a disbeliever. Is insulting any prophet something known from the religion by necessity, such that its perpetrator is a disbeliever, or is it one of the matters that may be obscure, and its perpetrator is excused by i

Answer:
The one who insults a prophet is an apostate who is killed and not asked to repent. By consensus. By consensus. He is killed and not asked to repent. From the religion of Islam. No one is ignorant of this. This is what no one is ignorant of. Does anyone not know that insulting Allah is shirk (associating partners with Allah)? Likewise, no one is ignorant that insulting the messengers (peace be upon them) is disbelief and shirk.