Sahih al-Bukhari 604
Narrated Ibn `Umar:
When the Muslims arrived at Medina, they used to assemble for the prayer, and used to guess the time 
for it. During those days, the practice of Adhan for the prayers had not been introduced yet. Once they 
discussed this problem regarding the call for prayer. Some people suggested the use of a bell like the 
Christians, others proposed a trumpet like the horn used by the Jews, but `Umar was the first to 
suggest that a man should call (the people) for the prayer; so Allah's Messenger (ﷺ) ordered Bilal to get up 
and pronounce the Adhan for prayers.
حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ، قَالَ أَخْبَرَنَا ابْنُ جُرَيْجٍ، قَالَ أَخْبَرَنِي نَافِعٌ، أَنَّ ابْنَ عُمَرَ، كَانَ يَقُولُ كَانَ الْمُسْلِمُونَ حِينَ قَدِمُوا الْمَدِينَةَ يَجْتَمِعُونَ فَيَتَحَيَّنُونَ الصَّلاَةَ، لَيْسَ يُنَادَى لَهَا، فَتَكَلَّمُوا يَوْمًا فِي ذَلِكَ، فَقَالَ بَعْضُهُمْ اتَّخِذُوا نَاقُوسًا مِثْلَ نَاقُوسِ النَّصَارَى‏.‏ وَقَالَ بَعْضُهُمْ بَلْ بُوقًا مِثْلَ قَرْنِ الْيَهُودِ‏.‏ فَقَالَ عُمَرُ أَوَلاَ تَبْعَثُونَ رَجُلاً يُنَادِي بِالصَّلاَةِ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ يَا بِلاَلُ قُمْ فَنَادِ بِالصَّلاَةِ ‏"‏‏.‏