Sahih Muslim 1148
Sahih Muslim · Book 13: The Book of Fasting · Making up fasts on behalf of the deceased
Ibn Abbas (Allah be pleased with them) reported:
وَحَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ ، وَابْنُ أَبِي خَلَفٍ ، وَعَبْدُ بْنُ حُمَيْدٍ ، جَمِيعًا عَنْ زَكَرِيَّاءَ، بْنِ عَدِيٍّ - قَالَ عَبْدٌ حَدَّثَنِي زَكَرِيَّاءُ بْنُ عَدِيٍّ ، - أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ عَمْرٍو ، عَنْ زَيْدِ، بْنِ أَبِي أُنَيْسَةَ حَدَّثَنَا الْحَكَمُ بْنُ عُتَيْبَةَ ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ ، عَنِ ابْنِ عَبَّاسٍ ، - رضى الله عنهما - قَالَ جَاءَتِ امْرَأَةٌ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَتْ يَا رَسُولَ اللَّهِ إِنَّ أُمِّي مَاتَتْ وَعَلَيْهَا صَوْمُ نَذْرٍ أَفَأَصُومُ عَنْهَا قَالَ " أَرَأَيْتِ لَوْ كَانَ عَلَى أُمِّكِ دَيْنٌ فَقَضَيْتِيهِ أَكَانَ يُؤَدِّي ذَلِكِ عَنْهَا " . قَالَتْ نَعَمْ . قَالَ " فَصُومِي عَنْ أُمِّكِ " .
A woman came to the Messenger of Allah (ﷺ) and said: Messenger of Allah, my mother has died and there is due from her a fast of vow; should I fast on her behalf? Thereupon he said: You see that if your mother had died in debt, would it not have been paid on her behalf? She said: Yes. He (the Holy Prophet) said: Then observe fast on behalf of your mother.