Musnad Ahmad 12467

Translation

✧ While the Prophet of Allah ﷺ was sitting among his companions, a Jew passed by them and greeted them. The Prophet ﷺ said, "Return it to him." So he said, "How did you say?" He replied, "I said, 'Sam alaykum' (poison be upon you)." The Messenger of Allah ﷺ said, "When one of the People of the Book greets you, say, 'Wa alayk' (and upon you)."

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