The Prophet said: "No one among the Muslim dies, and Salat is performed for him by a community of Muslims reaching one hundred, and they intercede (supplicate) for him, except that their intercession for him is accepted." In his narration, 'Ali bin Hujr said: "One hundred or more than that."
Reference: Jami` at-Tirmidhi 1029 In-book : Book 10, Hadith 65 English translation : Vol. 2, Book 5, Hadith 1029
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