(35) باب اثْنَانِ فَمَا فَوْقَهُمَا جَمَاعَةٌ
Narrated Malik bin Huwairith:
Prophet said (to two persons), "Whenever the prayer time becomes due, you should pronounce Adhan and then Iqama and the older of you should lead the prayer."
Reference: Sahih al-Bukhari 658
In-book reference: Book 10, Hadith 52
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 627