(30) باب مَنْ مَاتَ وَعَلَيْهِ نَذْرٌ
Narrated Ibn `Abbas:
A man came to the Prophet (ﷺ) and said to him, "My sister vowed to perform the Hajj, but she died (before fulfilling it)." The Prophet (ﷺ) said, "Would you not have paid her debts if she had any?" The man said, "Yes." The Prophet (ﷺ) said, "So pay Allah's Rights, as He is more entitled to receive His rights."
Reference: Sahih al-Bukhari 6699
In-book reference: Book 83, Hadith 76
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 690