from his father, from his grandfather, that the Messenger of Allah (ﷺ) said: "He is not one of us who resembles other than us, no who resembles the Jews nor the Christians. For indeed greeting of the Jews is pointing the finger, and the greeting of the Christians is waving with the hand."
Reference: Jami` at-Tirmidhi 2695 In-book : Book 42, Hadith 8 English translation : Vol. 5, Book 40, Hadith 2695
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