Hadith # 857
Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (PBUH) said, 'A rider should greet a pedestrian; a pedestrian should greet one who is sitting; and a small group should greet a large group (of people)."
[Al-Bukhari and Muslim]
Commentary
The narration in Al-Bukhari adds: Messenger of Allah (PBUH) said, "The young should greet the elderly." Commentary: The greeting of As-Salamu Alaikum should be uttered according to the prescribed way. It is the situations under reference and not the grades which will be taken into consideration in this respect.
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