Narrated Abu Huraira: Allah's Apostle said, "The riding person should greet the walking one, and the walking one should greet the sitting one, and the small number of persons should greet the large number of persons."
Hadith ReferenceSahih Bukhari / The Book of Asking Permission / Hadith: 6233
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة