Asking Permission

Bukhari :: Book 8 :: Volume 74 :: Hadith 250

Narrated Abu Huraira:

The Prophet said, "The young should greet the old, the passer by should greet the sitting one, and the small group of persons should greet the large group of persons. "

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star