Hadith 169

Bulugh al-Maram

Book 2: The Book of Prayer
وَعَنْهُ قَالَ : { كَانَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-إِذَا فَرَغَ مِنْ قِرَاءَةِ أُمِّ اَلْقُرْآنِ رَفَعَ صَوْتَهُ وَقَالَ : .‏ } رَوَاهُ اَلدَّارَقُطْنِيُّ وَحَسَّنَهُ , وَالْحَاكِمُ وَصَحَّحَهُ .‏ 1‏ .‏
"آمِينَ"
[Abu Hurairah (RA)]:

When Allah's Messenger (RA) completed the recitation of Surat Al-Fatiha, he raised his voice and said Amin. [Reported by ad-Daraqutni who graded it Hasan (good) and Al-Hakim who graded it Sahih (authentic)).