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»
He told of a man coming to the Prophet (sallallahu alayhi wa sallam) and saying that his sister had taken a vow to make the pilgrimage, but had died. The Prophet (sallallahu alayhi wa sallam) 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.
Mishkat al-Masabih 2405, Book 11, The Rites of Pilgrimage, Hadith 7. 1 min read