وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «إِن بِلَالًا يُؤذن بِلَيْلٍ فَكُلُوا وَاشْرَبُوا حَتَّى يُنَادِيَ ابْنُ أُمِّ مَكْتُوم» ثمَّ قَالَ: وَكَانَ رَجُلًا أَعْمَى لَا يُنَادِي حَتَّى يُقَالَ لَهُ: أَصبَحت أَصبَحت

Malik b. al-Huwairith said that he and a cousin of his came to the Prophet, who said, “When you two are on a journey, you should call the adhan and repeat the iqama, then the older of you should act as imam.” This is how Bukhari transmitted it.