(454) بَابُ تَسْلِيمِ الرَّاكِبِ عَلَى الْقَاعِدِ
Fadala reported that the Prophet, may Allah bless him and granthim peace, said, "The person riding greets the person sitting and the smallgroup greets the larger."
Reference: Al-Adab Al-Mufrad 996
In-book reference: Book 42, Hadith 32
English translation: Book 42, Hadith 996