(Imām Bukhārī narrates): Sulaimān ibn Harb narrated to us, he said: Hammād ibn Zaid narrated to us, from Ayyūb, from Abī Qilābah, from Mālik ibn al-Huwairith, may Allāh be pleased with him, he said:
We came to the Prophet ﷺ, and we were all young. We stayed with him for about twenty nights, and the Prophet ﷺ was very kind. So he said: If you return to your families, and teach them, and command them that they should pray in such a way — at this time, and at this time, and at this time — then when the time of prayer comes, one of you should give the adhān, and whoever among you is older in age should lead the prayer.
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ أَيُّوبَ، عَنْ أَبِي قِلاَبَةَ، عَنْ مَالِكِ بْنِ الْحُوَيْرِثِ، قَالَ قَدِمْنَا عَلَى النَّبِيِّ صلى الله عليه وسلم وَنَحْنُ شَبَبَةٌ، فَلَبِثْنَا عِنْدَهُ نَحْوًا مِنْ عِشْرِينَ لَيْلَةً، وَكَانَ النَّبِيُّ صلى الله عليه وسلم 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 ".
Reference: Sahih Al Bukhari 685