Ibn Hibban

It is narrated about Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both). One of his sons passed away at Qudayd, or perhaps at ‘Usfan, so he said: “O Kurayb, check how many people have gathered for his funeral prayer.” The narrator says: I went outside and found that some people had gathered, so I informed Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) about it. He asked: “Are there forty people?” I replied: “Yes.” So Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: “Bring out his body, for I heard the Noble Prophet (peace and blessings be upon him) say: ‘Whenever a Muslim passes away and forty people who do not associate anything with Allah perform his funeral prayer, Allah accepts their intercession for that deceased.’”