صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب قيام المأمومين خلف الإمام وما فيه من السننChapters on Followers Standing Behind the Imam
(93) بَابُ ذِكْرِ مَا كَانَ اللَّهُ- عَزَّ وَجَلَّ- خَصَّ نَبِيَّهُ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِالتَّأْمِينِ93| What Allah has favored His Prophet (ﷺ) with regarding "Ameen"
Hadith Q1586
فَلَمْ يُعْطِهِ أَحَدًا مِنَ النَّبِيِّينَ قَبْلَهُ، خَلَا هَارُونَ حِينَ دَعَا مُوسَى، فَأَمَّنَ هَارُونُ، إِنْ ثَبَتَ الْخَبَرُ.
This characteristic was not granted to any prophet before you. It was only granted to Hazrat Harun (peace be upon him) when Hazrat Musa (peace be upon him) made supplication and Hazrat Harun (peace be upon him) said Ameen. Provided that the narration reported in this regard is authentic.
