"When Malik bin Hubairah performed Salat for a funeral and the people were few he would divide them into three groups (rows) then say: 'The Messenger of Allah said: "For whomever three rows perform Salat, then it is granted."
Reference: Jami` at-Tirmidhi 1028 In-book : Book 10, Hadith 64 English translation : Vol. 2, Book 5, Hadith 1028
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