Is Shia Self⁠-⁠Flagellation Permissible in Islam

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Question:

Is it permissible in Islam for Shia Muslims to harm themselves during Muharram? - A discussion of Shia practices of mourning during Muharram, including self-beating and harm, and whether such acts are sanctioned in Islam. :::

Answer:

O you who believe! Eat not up your property among yourselves unjustly except it be a trade amongst you, by mutual consent. And do not kill yourselves (nor kill one another). Surely, Allâh is Most Merciful to you. (An-Nisa 4:29)

And spend in the Cause of Allâh (i.e. Jihâd of all kinds, etc.) and do not throw yourselves into destruction (by not spending your wealth in the Cause of Allâh), and do good. Truly, Allâh loves Al-Muhsinûn (the good-doers). (Al-Baqarah 2:195)

Prophet Muhammad, Peace be upon him, said: «Two things in people are Kufr (Ignorance), one is to ridicule someone on his family genealogy, and the other is bewailing loudly the dead» (Reported by Muslim).

Prophet Muhammad, Peace be upon him, also said: «I detest a woman who cries out very loudly, or shaves her hair, or tears her clothes when a beloved one dies» (Reported by Bukhari & Muslim).

Prophet Muhammad, Peace be upon him, said: «He is not of us who beats his face, tears his clothes and bewails loudly when misfortune happens to him as was done before during the days of ignorance» (Reported by Bukhari & Muslim).

Narrated Um ‘Atiyya We were forbidden to mourn for more than three days for a dead person, except for a husband, for whom a wife should mourn for four months and ten days [Divorce - Sahih Bukhari, Volume 7 - Hadith]

So, Relatives of a deceased Muslim may mourn him for three days only, but a widow may mourn her husband four months and ten days.

Hence keeping in view the above references from Quran & Sunnah it is totally un-islamic and sinful to show grief during moharram of those people who died centuries back.