Hadith 2:166
Narrated [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)).
وَعَنْهُ قَالَ : { كَانَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -إِذَا فَرَغَ مِنْ قِرَاءَةِ أُمِّ اَلْقُرْآنِ رَفَعَ صَوْتَهُ وَقَالَ : "آمِينَ" } رَوَاهُ اَلدَّارَقُطْنِيُّ وَحَسَّنَهُ , وَالْحَاكِمُ وَصَحَّحَهُ