‏السلام : Hadeeth No:5374 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) 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)....

‏الإمارة : Hadeeth No:4644 This tradition has been narrated on the authority of Abu Ayyub through a different chain of transmitters having the same wording....