Why Do We Say “Ameen” After Al-Fatiha?

Why do we say “ameen” after al-fatiha?

“Ameen” is the word uttered at the end of duas in order to express our hope that Allah accepts them. The Prophet Muhammad (saw) advised to say “ ameen” at the end of duas (Bukhari, Adhan, 111; Muslim, Salat, 72, 74, 75; Ibn Majah, Iqamat al-Salat, 14).

According to Hanafi school, it is sunnah to utter “ ameen” silently at the end of Fatiha. There is no difference about this issue between imam, the congregation, or those who perform prayer individually (Ibn Abidin, Radd al-Muhtar, II, 172).

According to the Shafi’i school, “ ameen” is uttered loudly in prayers with aloud qiraat, and with a low voice in prayers with silent qiraat (Shirazi, al-Muhadhdhab, I, 139-140).

Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS