Sunan an-Nasa'i #781 · The Book of Leading the Prayer (Al-Imamah)

Sunan an-Nasa'iIt was narrated that Malik bin Al-Huwairith said
Sunan an-Nasa'i · Book 10 · The Book of Leading the Prayer (Al-Imamah)
Sunan an-Nasa'i · كتاب 10 · كتاب الإمامة
"I came to the Messenger of Allah (ﷺ) with a cousin of mine" - once he said, "with a friend of mine" - and he said: 'When you travel, call the Adhan and Iqamah, and let the older of you lead the prayer
أَخْبَرَنَا حَاجِبُ بْنُ سُلَيْمَانَ الْمَنْبِجِيُّ، عَنْ وَكِيعٍ، عَنْ سُفْيَانَ، عَنْ خَالِدٍ الْحَذَّاءِ، عَنْ أَبِي قِلاَبَةَ، عَنْ مَالِكِ بْنِ الْحُوَيْرِثِ، قَالَ أَتَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم أَنَا وَابْنُ عَمٍّ لِي - وَقَالَ مَرَّةً أَنَا وَصَاحِبٌ لِي - فَقَالَ ‏
"‏ إِذَا سَافَرْتُمَا فَأَذِّنَا وَأَقِيمَا وَلْيَؤُمَّكُمَا أَكْبَرُكُمَا ‏"‏ ‏.‏
Reference : Sunan an-Nasa'i 781In-book reference : Book 10, Hadith 5