Abu Sa'eed narrated:
"The Messenger of Allah (s.a.w) said: 'How can I be comfortable when the one with the horn is holding it to his lip, his ears listening for when he will be ordered to blow, so he can blow.' It was as if that was very hard upon the Companions of the Prophet (s.a.w), so he said to them: 'Say: "Allah is sufficent for us and what a good protector He is, and upon Allah we rely." [Abu' Eisa said:] This Hadith is Hasan. This Hadith has been reported through other routes from 'Atiyyah, from Abu Sa'eed [AlKhudri] from the Prophet SAW, similarly.
حَدَّثَنَا سُوَيْدٌ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا خَالِدٌ أَبُو الْعَلاَءِ، عَنْ عَطِيَّةَ، عَنْ أَبِي سَعِيدٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " كَيْفَ أَنْعَمُ وَصَاحِبُ الْقَرْنِ قَدِ الْتَقَمَ الْقَرْنَ وَاسْتَمَعَ الإِذْنَ مَتَى يُؤْمَرُ بِالنَّفْخِ فَيَنْفُخُ " . فَكَأَنَّ ذَلِكَ ثَقُلَ عَلَى أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم فَقَالَ لَهُمْ " قُولُوا حَسْبُنَا اللَّهُ وَنِعْمَ الْوَكِيلُ عَلَى اللَّهِ تَوَكَّلْنَا " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ . وَقَدْ رُوِيَ مِنْ غَيْرِ وَجْهٍ هَذَا الْحَدِيثُ عَنْ عَطِيَّةَ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ عَنِ النَّبِيِّ صلى الله عليه وسلم نَحْوَهُ .
