General Behavior (Kitab Al-Adab)
43/146. Chapter:
Regarding who should be greeted first
Sunan Abi Dawud
حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنْ هَمَّامِ بْنِ مُنَبِّهٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " يُسَلِّمُ الصَّغِيرُ عَلَى الْكَبِيرِ وَالْمَارُّ عَلَى الْقَاعِدِ وَالْقَلِيلُ عَلَى الْكَثِيرِ " .
Abu Hurairah reported the Messenger of Allah (May peace be upon him) as saying : The young should salute the old, the one who is passing by should salute the one who is sitting, and a small company should salute a large one.
Reference : Sunan Abi Dawud 5198In-book reference : Book 43, Hadith 426English translation : Book 42, Hadith 5179