Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tabarani:18329[Chain 1] al-Miqdām b. Dāwud > Asad b. Mūsá [Chain 2] Muʿādh b. al-Muthanná > Musaddad > Abū al-Aḥwaṣ > Abū Isḥāq > ʿAbd al-Jabbār b. Wāʾil from his father

[Machine] I prayed with the Messenger of Allah ﷺ , and he recited Al-Fatiha (the opening chapter of the Quran). After he finished reciting it, he said, "Ameen" and prolonged his voice with it.  

الطبراني:١٨٣٢٩حَدَّثَنَا الْمِقْدَامُ بْنُ دَاوُدَ ثنا أَسَدُ بْنُ مُوسَى ح وَحَدَّثَنَا مُعَاذُ بْنُ الْمُثَنَّى ثنا مُسَدَّدٌ قَالَا ثنا أَبُو الْأَحْوَصِ عَنْ أَبِي إِسْحَاقَ عَنْ عَبْدِ الْجَبَّارِ بْنِ وَائِلٍ عَنْ أَبِيهِ قَالَ

صَلَّيْتُ مَعَ رَسُولِ اللهِ ﷺ فَقَرَأَ بِفَاتِحَةِ الْكِتَابِ فَلَمَّا فَرَغَ مِنْهَا قَالَ «آمِينَ» يَمُدُّ بِهَا صَوْتَهُ