NASAI-KUBRA 3598: from Āmraʾah Nadharat —
a woman vowed to perform Hajj but she died. Her brother came to the Prophet and asked him about that, he said: 'Do yhou think that if your sister owed a debt you wouold pay it off?' He said: 'Yes.' He said: 'Then fulfill the right of Allah, for He is more deserving that His rights should be fulfilled.''' (Using translation from Nasāʾī 2632)

الكبرى للنسائي ٣٥٩٨: عن امرءه نذرت —
أَنْ تَحُجَّ فَمَاتَتْ فَأَتَى أَخُوهَا النَّبِيَّ ﷺ فَسَأَلَهُ عَنْ ذَلِكَ فَقَالَ «أَرَأَيْتَ لَوْ كَانَ عَلَى أُخْتِكَ دَيْنٌ أَكُنْتَ قَاضِيَهُ؟» قَالَ نَعَمْ قَالَ «فَاقْضُوا اللهَ فَهُوَ أَحَقُّ بِالْوَفَاءِ»


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Nasāʾī's Kubrá > Ḥajj and ʿUmrah Rites > § [Machine] Performing Hajj on behalf of a deceased person...
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