Narrated Wa'il ibn Hujr: When the Messenger of Allah (ﷺ) recited the verse "Nor of those who go astray" (Surah al-Fatihah, verse 7), he would say Amin; and raised his voice (while uttering this word)
SahihSahihSahihBook 2 · Hadith 543
سنن أبي داود
Narrated Wa'il ibn Hujr: When the Messenger of Allah (ﷺ) recited the verse "Nor of those who go astray" (Surah al-Fatihah, verse 7), he would say Amin; and raised his voice (while uttering this word)