(18) باب الأَذَانِ لِلْمُسَافِرِ إِذَا كَانُوا جَمَاعَةً، وَالإِقَامَةِ، وَكَذَلِكَ بِعَرَفَةَ وَجَمْعٍ
Narrated Malik bin Huwairith:
Two men came to the Prophet (ﷺ) with the intention of a journey. The Prophet (ﷺ) said, "When (both of) you set out, pronounce Adhan and then Iqama and the oldest of you should lead the prayer." (ES)
Reference (ES): Sahih al-Bukhari 630 (ES)
In-book reference (ES): Book 10, Hadith 27 (ES)
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 603 (ES)