The word "آمين" is not an Arabic word ?

[Abubakar]

Salam

I learnt from a Shi'a that the word is not Arabic word.
That is they don't say "آمين" In Prayers since it will Invalidate the prayer.

Is this true ?

[Bolani Muslim]

Firstly, Shias say 'aameen' in their duas which came from the Imams. If it's not an Arabic word, then why would the Shia imams use it in their holy duas?
Secondly, saying 'aameen' isn't a necessary part of the Salaat.

[MuslimK]

Walaikum Salam,

First of all, we Muslims say Aameen because the Messenger of Allah (saw) instructed us.

Anyways, here pro-Aameen narration from their books:

[ 7366 ] 5 ـ وعنه ، عن ابن أبي عمير ، عن جميل قال : سألت أبا عبد الله ( عليه السلام ) عن قول الناس في الصلاة جماعة حين يقرأ فاتحة الكتاب : آمـيـن ؟ قال : مـا أحـسـنـهـا واخفض الصوت بها.
التهذيب 2 : 75|277 , الاستبصار 1 : 318|1187 , وسائل الشيعة ج 6 ص 68

[7366] 5 - From ibn abi 'Umayr from Jameel bin Darraj al-Nakh'ee: I asked abu 'Abdullah (as) about the saying of the people during Salat after the Fatiha of the Book: Ameen? He (as) said: "How good it is when in a low voice."

source: al-Tahtheeb 2 : 75/277, al-Istibsar 1 : 318/1187, Wasael al-Shia 6/68.

al-Khoei said this narration is SAHIH in al-Mustanad fi Sharh al-'Urwah al-Wusta 5/514: "ربّما تعارض هذه النصوص بصحيحة اُخرى لجميل ظاهرة في الجواز".