كتاب الجامع
16  
The Comprehensive Book
Ali (RAA) narrated that the Messenger of Allah (ﷺ) said:
“When a group of people passes by, it is sufficient if one of them gives a salutation, and it is sufficient for those who are sitting that one of them replies.” Related by Ahmad and Al-Baihaqi.
وَعَنْ عَلِيٍّ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ يُجْزِئُ عَنْ اَلْجَمَاعَةِ إِذَا مَرُّوا أَنْ يُسَلِّمَ أَحَدُهُمْ, وَيُجْزِئُ عَنْ اَلْجَمَاعَةِ أَنْ يَرُدَّ أَحَدُهُمْ } رَوَاهُ أَحْمَدُ, وَالْبَيْهَقِيُّ 1‏ .‏


‏1 ‏- حسن بشواهده رواه أبو داود (5210)‏، والبيهقي (9 / 49)‏.‏

Sunnah.com reference : Book 16, Hadith 9
English translation : Book 16, Hadith 1488
Arabic reference : Book 16, Hadith 1444