"When we awoke, we went to Messenger of Allah to inform him of the dream. He said: 'Indeed this dream is true. So go to Bilal, for he has a better and louder voice than you. Convey to him what was said to you, so that he may call (to the prayer) with that.'" He said: "When Umar bin Al-Khattab heard Bilal calling for the prayer he went to Messenger of Allah, and he was dragging his Izar, (as he was hurrying) saying: 'O Messenger of Allah! By the One Who sent you with the truth! I dreamt the same as what he said.''' He said: "So Messenger of Allah said: 'To Allah is the praise, so that confirms it even more.'''  

لَمَّا أَصْبَحْنَا أَتَيْنَا رَسُولَ اللَّهِ ﷺ فَأَخْبَرْتُهُ بِالرُّؤْيَا فَقَالَ إِنَّ هَذِهِ لَرُؤْيَا حَقٍّ فَقُمْ مَعَ بِلاَلٍ فَإِنَّهُ أَنْدَى وَأَمَدُّ صَوْتًا مِنْكَ فَأَلْقِ عَلَيْهِ مَا قِيلَ لَكَ وَلْيُنَادِ بِذَلِكَ قَالَ فَلَمَّا سَمِعَ عُمَرُ بْنُ الْخَطَّابِ نِدَاءَ بِلاَلٍ بِالصَّلاَةِ خَرَجَ إِلَى رَسُولِ اللَّهِ ﷺ وَهُوَ يَجُرُّ إِزَارَهُ وَهُوَ يَقُولُ يَا رَسُولَ اللَّهِ وَالَّذِي بَعَثَكَ بِالْحَقِّ لَقَدْ رَأَيْتُ مِثْلَ الَّذِي قَالَ قَالَ فَقَالَ رَسُولُ اللَّهِ ﷺ فَلِلَّهِ الْحَمْدُ فَذَلِكَ أَثْبَتُ قَالَ وَفِي الْبَابِ عَنِ ابْنِ عُمَرَ  

"When the Muslims arrived in AI-Madinah, they used to assemble for the Salat, and guess the time for it there was no one who called for it (the prayer). One day they discussed that and some of them said that they should use a bell like the bell the Christians use. Others said they should use a trumpet like the horn the Jews use. But Umar [bin Al-Khattab] said: 'Wouldn't it better if we had a man call for the prayer?'" He said: "So Messenger of Allah said: 'O Bilal! Stand up and call for the Salat.'"  

كَانَ الْمُسْلِمُونَ حِينَ قَدِمُوا الْمَدِينَةَ يَجْتَمِعُونَ فَيَتَحَيَّنُونَ الصَّلَوَاتِ وَلَيْسَ يُنَادِي بِهَا أَحَدٌ فَتَكَلَّمُوا يَوْمًا فِي ذَلِكَ فَقَالَ بَعْضُهُمُ اتَّخِذُوا نَاقُوسًا مِثْلَ نَاقُوسِ النَّصَارَى وَقَالَ بَعْضُهُمُ اتَّخِذُوا قَرْنًا مِثْلَ قَرْنِ الْيَهُودِ قَالَ فَقَالَ عُمَرُ بْنُ الْخَطَّابِ أَوَلاَ تَبْعَثُونَ رَجُلاً يُنَادِي بِالصَّلاَةِ قَالَ فَقَالَ رَسُولُ اللَّهِ ﷺ يَا بِلاَلُ قُمْ فَنَادِ بِالصَّلاَةِ