"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.'"
Sunan an-Nasa'i Book 10, Hadith 5
← Previous Hadith "The Messenger of Allah(ﷺ)said: 'Let the one who has most knowledge of the Book of Allah lead the people in prayer. If they are equal in terms of knowledge of the Qur'h, let the one who emigrated first (lead them). If they are equal in terms of emigration, let the one who has more knowledge of the Sunnah, (lead them). If they are equal in terms of knowledge of the Sunnah, let the one who is oldest (lead them). Do not lead a man in prayer in his place of authority, and do not sit in his place of honor, unless he gives you permission."'

Sunan an-Nasa'i Book 10, Hadith 4 Next Hadith → "when there are three people let one of them lead the prayer, and the one who is most entitled to lead the prayer is the one who has most knowledge of the Qur'an."

Sunan an-Nasa'i Book 10, Hadith 6