If the debts due on a dead person are transferred to somebody, the transference is legal

Sahih al-Bukhari · Book 38 · Hadith 2289

حَدَّثَنَا الْمَكِّيُّ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا يَزِيدُ بْنُ أَبِي عُبَيْدٍ، عَنْ سَلَمَةَ بْنِ الأَكْوَعِ ـ رضى الله عنه ـ قَالَ كُنَّا جُلُوسًا عِنْدَ النَّبِيِّ صلى الله عليه وسلم إِذْ أُتِيَ بِجَنَازَةٍ، فَقَالُوا صَلِّ عَلَيْهَا‏.‏ فَقَالَ ‏"‏ هَلْ عَلَيْهِ دَيْنٌ ‏"‏‏.‏ قَالُوا لاَ‏.‏ قَالَ ‏"‏ فَهَلْ تَرَكَ شَيْئًا ‏"‏‏.‏ قَالُوا لاَ‏.‏ فَصَلَّى …

Narrated Salama bin Al-Akwa: Once, while we were sitting in the company of Prophet, a dead man was brought. The Prophet (ﷺ) was requested to lead the funeral prayer for the deceased. He said, "Is he in debt?" The peo…