We went to the Prophet ﷺ and we were all young men and stayed with him for about twenty nights. The Prophet ﷺ was very merciful. He said, "When you return home, impart religious teachings to your families and tell them to offer perfectly such and such a prayer at such and such a time and such and such a prayer at such and such a time. And at the time of the prayer one of you should pronounce the Adhan and the oldest of you should lead the prayer."  

قَدِمْنَا عَلَى النَّبِيِّ ﷺ وَنَحْنُ شَبَبَةٌ فَلَبِثْنَا عِنْدَهُ نَحْوًا مِنْ عِشْرِينَ لَيْلَةً وَكَانَ النَّبِيُّ ﷺ رَحِيمًا فَقَالَ لَوْ رَجَعْتُمْ إِلَى بِلاَدِكُمْ فَعَلَّمْتُمُوهُمْ مُرُوهُمْ فَلْيُصَلُّوا صَلاَةَ كَذَا فِي حِينِ كَذَا وَصَلاَةَ كَذَا فِي حِينِ كَذَا وَإِذَا حَضَرَتِ الصَّلاَةُ فَلْيُؤَذِّنْ لَكُمْ أَحَدُكُمْ وَلْيَؤُمَّكُمْ أَكْبَرُكُمْ