The Book of Funerals
21/78. Chapter:
The Virtue Of the One For Whom One Hundred People Offer The Funeral Prayer
Sunan an-Nasai
أَخْبَرَنَا عَمْرُو بْنُ زُرَارَةَ، قَالَ أَنْبَأَنَا إِسْمَاعِيلُ، عَنْ أَيُّوبَ، عَنْ أَبِي قِلاَبَةَ، عَنْ عَبْدِ اللَّهِ بْنِ يَزِيدَ، - رَضِيعٌ لِعَائِشَةَ رضى الله عنها - عَنْ عَائِشَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " لاَ يَمُوتُ أَحَدٌ مِنَ الْمُسْلِمِينَ فَيُصَلِّي عَلَيْهِ أُمَّةٌ مِنَ النَّاسِ فَيَبْلُغُوا أَنْ يَكُونُوا مِائَةً فَيَشْفَعُوا إِلاَّ شُفِّعُوا فِيهِ " .
It was narrated from 'Aishah that the Prophet said: "No Muslim dies and a group of people whose number reaches one hundred offers the funeral prayer for him, interceding fro him, but their intercession for him will be accepted."
Reference : Sunan an-Nasa'i 1992In-book reference : Book 21, Hadith 175English translation : Vol. 3, Book 21, Hadith 1994