Sahih al-Bukhari 3236
Sahih al-Bukhari · Book 59: Beginning of Creation · If anyone says Amin [during the Salat (prayer) at the end of the recitation of Surat Al-Fatiha]
Narrated Samura:
حَدَّثَنَا مُوسَى ، حَدَّثَنَا جَرِيرٌ ، حَدَّثَنَا أَبُو رَجَاءٍ ، عَنْ سَمُرَةَ ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " رَأَيْتُ اللَّيْلَةَ رَجُلَيْنِ أَتَيَانِي قَالاَ الَّذِي يُوقِدُ النَّارَ مَالِكٌ خَازِنُ النَّارِ، وَأَنَا جِبْرِيلُ، وَهَذَا مِيكَائِيلُ " .
The Prophet (ﷺ) said, "Last night I saw (in a dream) two men coming to me. One of them said, "The person who kindles the fire is Malik, the gate-keeper of the (Hell) Fire, and I am Gabriel, and this is Michael."