Jami` at-Tirmidhi, Book 47, Hadith 3551 (In-Book) ⓘ
Narrated Abu Sa'eed Al-Khudri: that the Messenger of Allah said: "How can I be comfortable when the one with the horn is holding it in his lips and his forehead is leaning forward, waiting to be given permission to blow?" The Muslims said: "So what should we say, O Messenger of Allah?" He said: "Say: 'Allah is sufficient for us and what a good protector He is. We rely upon [our Lord] Allah'" - and perhaps Sufyan (one of the narrators) said: "upon Allah we rely."
حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنْ مُطَرِّفٍ، عَنْ عَطِيَّةَ الْعَوْفِيِّ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " كَيْفَ أَنْعَمُ وَقَدِ الْتَقَمَ صَاحِبُ الْقَرْنِ الْقَرْنَ وَحَنَى جَبْهَتَهُ وَأَصْغَى سَمْعَهُ يَنْتَظِرُ أَنْ يُؤْمَرَ أَنْ يَنْفُخَ فَيَنْفُخَ " . قَالَ الْمُسْلِمُونَ فَكَيْفَ نَقُولُ يَا رَسُولَ اللَّهِ قَالَ " قُولُوا حَسْبُنَا اللَّهُ وَنِعْمَ الْوَكِيلُ تَوَكَّلْنَا عَلَى اللَّهِ رَبِّنَا " . وَرُبَّمَا قَالَ سُفْيَانُ عَلَى اللَّهِ تَوَكَّلْنَا . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ . وَقَدْ رَوَاهُ الأَعْمَشُ أَيْضًا عَنْ عَطِيَّةَ عَنْ أَبِي سَعِيدٍ .
also referenced under: Hadith 3243 (Reference) & Volume 5, Book 44, Hadith 3243 (DarusSalam)