A caller went out saying: Either you are with 'Ali or with Mu'awiyah, and then he spoke about Mu'awiyah (may Allah be pleased with him)!!

Question:
Honorable Shaykh, may Allah grant you success. The questioner says: In these days, one of those who claim to be callers to Allah appeared on one of the media outlets and said, "Either you are with the Rightly Guided Caliph 'Ali or with Mu'awiyah," and he spoke ill of Mu'awiyah, the noble Companion (may Allah be pleased with him).

Answer:
Is this a Shi'i, or does he not follow the Shi'ah? This is either a Shi'i, or he follows the Shi'ah, because some students of knowledge who have not mastered the knowledge are deceived by some of the statements of the Shi'ah, so they speak in their language. This is not permissible. It is not permissible to speak about the Companions. It is not permissible to speak about any Companion of the Messenger of Allah (peace and blessings be upon him).
Do not insult them. Look, do not insult my Companions. This is general for all the Companions of the Messenger of Allah. Do not insult my Companions. Yes. So it is not permissible to insult any of the Companions. And Mu'awiyah (may Allah be pleased with him) is a Companion among the best of the Companions.
And the best of the kings of Islam is Mu'awiyah (may Allah be pleased with him), and the most just of them. So it is not permissible to speak about Mu'awiyah. This is merely a Shi'i spirit, a Shi'i spirit. They hunt for faults in the Companions and speak about them. So one must be cautious of that. Yes.