(35) باب مَنْ مَاتَ وَعَلَيْهِ نَذْرٌ
It was narrated that Ibn 'Abbas said:
"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. The Messenger of Allah said: 'Fulfill it on her behalf.'"
Reference: Sunan an-Nasa'i 3818
In-book reference: Book 35, Hadith 58
English translation: Vol. 4, Book 35, Hadith 3849