Sahih al-Bukhari 5371
Narrated Abu Huraira:
A dead man in debt used to be brought to Allah's Messenger (ﷺ) who would ask, "Has he left anything to re 
pay his debts?" If he was informed that he had left something to cover his debts the Prophet (ﷺ) would 
offer the funeral prayer for him; otherwise he would say to the Muslims present there), "Offer the 
funeral prayer for your friend:"but when Allah helped the Prophet (ﷺ) to gain victory (on his expeditions), 
he said, "I am closer to the Believers than themselves, so. if one of the Believers dies in debt, I will 
repay it, but if he leaves wealth, it will be for his heirs.
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، حَدَّثَنَا اللَّيْثُ، عَنْ عُقَيْلٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يُؤْتَى بِالرَّجُلِ الْمُتَوَفَّى عَلَيْهِ الدَّيْنُ، فَيَسْأَلُ ‏"‏ هَلْ تَرَكَ لِدَيْنِهِ فَضْلاً ‏"‏‏.‏ فَإِنْ حُدِّثَ أَنَّهُ تَرَكَ وَفَاءً صَلَّى، وَإِلاَّ قَالَ لِلْمُسْلِمِينَ ‏"‏ صَلُّوا عَلَى صَاحِبِكُمْ ‏"‏‏.‏ فَلَمَّا فَتَحَ اللَّهُ عَلَيْهِ الْفُتُوحَ قَالَ ‏"‏ أَنَا أَوْلَى بِالْمُؤْمِنِينَ مِنْ أَنْفُسِهِمْ، فَمَنْ تُوُفِّيَ مِنَ الْمُؤْمِنِينَ فَتَرَكَ دَيْنًا فَعَلَىَّ قَضَاؤُهُ، وَمَنْ تَرَكَ مَالاً فَلِوَرَثَتِهِ ‏"‏‏.‏