Abdu'r-Rahman ibn Shibl said that he heard the Prophet (ﷺ) said, "The person riding should greet the person on foot. The person on foot should greet the person who is seated. The smaller group should greet the large. Whoever answers the greeting, that is for him. Whoever does not answer it, has nothing."
Reference: Al-Adab Al-Mufrad 992 In-book : Book 42, Hadith 28 English translation : Book 42, Hadith 992
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