صحیح ابن حبان
Ibn Hibban
كتاب النذور
Book of Vows
ذكر البيان بأن نذر الناذرة إذا ماتت قبل أن تفي بنذرها لبعض قرابتها قضاء ذلك النذر عنها وإن كان النذر صوما-
Clarification that if a woman dies before fulfilling her vow, her relatives may fulfill it for her, even if it was fasting
1 hadith
Hadith 4396
Abdullah bin Abbas (may Allah be pleased with them) narrates: A woman came to the service of the Prophet (peace be upon him) and said: My mother has passed away and she was obliged to observe a fast as a vow. The Prophet (peace be upon him) said to this woman: Would you pay off the debt of your mother if it was obligatory upon her? The woman replied: Yes. The Prophet (peace be upon him) said: Then you should also fast on behalf of your mother.