Mu'awiya ibn Qurra said that his father said to him, "My son, when a man passes by you and says, 'Peace be upon you (plural).' Do not say, 'And on you (singular)' as if you were singling out that greeting out for him alone. Rather say, 'Peace be upon you (plural).'"
Reference: Al-Adab Al-Mufrad 1037 In-book : Book 42, Hadith 74 English translation : Book 42, Hadith 1037
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