Jami At Tirmidhi
1029
Sahih+3

Aishah narrated that: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

SahihAhmad Muhammad Shakir
SahihAl-Albani