"The Prophet would say the Salam from his right and from his left (saying): (As-Salamu alaikum wa rahmatullah, as-Salamu alaikum wa rahmatullah) 'Peace be upon you, and Allah's mercy. Peace be upon you, and Allah's mercy.'"
Reference: Jami` at-Tirmidhi 295 In-book : Book 2, Hadith 147 English translation : Vol. 1, Book 2, Hadith 295
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