Hadith 3654
Chapter 8: The Virtue Of Charity Given On Behalf Of The Deceased - كتاب الوصايا
أَخْبَرَنَا الْحُسَيْنُ بْنُ عِيسَى، قَالَ أَنْبَأَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ سَعْدًا، سَأَلَ النَّبِيَّ صلى الله عليه وسلم إِنَّ أُمِّي مَاتَتْ وَلَمْ تُوصِ أَفَأَتَصَدَّقُ عَنْهَا قَالَ " نَعَمْ ".
It was narrated from Ibn 'Abbas that Sa'd asked the Prophet:
"My mother died and did not leave a will; shall I give charity on her behalf?" He said: "Yes."
Reference : Sunan an-Nasa'i 3654
In-book reference : Book 30, Hadith 44