(1) باب يُسَلِّمُ الرَّاكِبُ عَلَى الْمَاشِي وَالْقَلِيلُ عَلَى الْكَثِيرِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
The rider should first greet the pedestrian, and the pedestrian the one who is seated and a small group should greet a larger group (with as-Salam-u-'Alaikum). (IT)
Reference (IT): Sahih Muslim 2160 (IT)
In-book reference (IT): Book 39, Hadith 1 (IT)
USC-MSA web (English) reference(deprecated numbering scheme): Book 26, Hadith 5374 (IT)