The Book of Funerals
21/103. Chapter:
The Order To Seek Forgiveness For The Believers
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ : لَمَّا مَاتَ النَّجَاشِيُّ قَالَ النَّبِيُّ صلى الله عليه وسلم : " اسْتَغْفِرُوا لَهُ " .
It was narrated that Abu Hurairah said: "When An-Najashi died, the Prophet said: 'Pray for forgiveness for him."'
Reference : Sunan an-Nasa'i 2041In-book reference : Book 21, Hadith 224English translation : Vol. 3, Book 21, Hadith 2043