Abu Dawud
General Behavior
Book Number: 036 / Hadith Number: 5186
Narated By AbuHurayrah : Suhayl ibn AbuSalih said: I went out with my father to Syria. The people passed by the cloisters in which there were Christians and began to salute them. My father said: Do not give them salutation first, for AbuHurayrah reported the Apostle of Allah (pbuh) as saying: Do not salute them (Jews and Christians) first, and when you meet them on the road, force them to go to the narrowest part of it.