Full Sharh — Mishkat al-Masabih 2404
وَعَنْهُ قَالَ: أَتَى رَجُلٌ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: إِنَّ أُخْتِي نَذَرَتْ أَنْ تَحُجَّ وَإِنَّهَا مَاتَتْ فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَوْ كَانَ عَلَيْهَا دَيْنٌ أَكَنْتَ قَاضِيَهُ؟» قَالَ: نَعَمْ قَالَ: «فَاقْضِ دَيْنَ اللَّهِ فَهُوَ أَحَقُّ بِالْقَضَاءِ»
English Translation
He told of a man coming to the Prophet and saying that his sister had taken a vow to make the pilgrimage, but had died. The Prophet asked whether he would pay a debt, supposing she owed one, and when he replied that he would, he said, “Well, pay the debt due to God, for it is the one which most deserves to be paid.” Bukhari and Muslim.
Source
Mishkat al-Masabih(مشكاة المصابيح)
The Rites of Pilgrimage
Hadith Number
2404