Mukhtasar Muslim

Umm al-Mu'mineen Aisha Siddiqa (may Allah be pleased with her) narrates from the Noble Prophet (peace and blessings be upon him) that he said: There is no deceased person upon whom a group of Muslims, whose number reaches one hundred, offers the funeral prayer and then all intercede for him (that is, pray to Allah for his forgiveness), except that their intercession will be accepted.