سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 3817
The Book of Oaths and Vows
If A Person Dies With A Vow Unfulfilled
أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، وَالْحَارِثُ بْنُ مِسْكِينٍ، قِرَاءَةً عَلَيْهِ وَأَنَا أَسْمَعُ، - وَاللَّفْظُ لَهُ - عَنْ سُفْيَانَ، عَنِ الزُّهْرِيِّ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ سَعْدَ بْنَ عُبَادَةَ، اسْتَفْتَى رَسُولَ اللَّهِ صلى الله عليه وسلم فِي نَذْرٍ كَانَ عَلَى أُمِّهِ تُوُفِّيَتْ قَبْلَ أَنْ تَقْضِيَهُ فَقَالَ اقْضِهِ عَنْهَا .
It was narrated from Ibn 'Abbas that Sa'd bin 'Ubadah asked the Messenger of Allah about a vow which his mother had sworn, but she died before she could fulfill it. He said: "Fulfill it on her behalf."
Sunan an-Nasa'i, 3817sahih (Darussalam)