Musannaf Ibn Abi Shaybah

Hazrat Burd narrates that Hazrat Makhool and Hazrat Sulaiman bin Musa, both of these personalities, stated: The younger will greet the elder with salam, the one who is standing will greet the one who is sitting with salam, the rider will greet the one who is walking with salam, and the few will greet the many with salam.