From Sahih Bukhari (Hadith 6731):
Narrated Abu Huraira:The Prophet (ﷺ) said, "I am more closer to the believers than their own selves, so whoever (of them) dies while being in debt and leaves nothing for its repayment, then we are to pay his debts on his behalf and whoever (among the believers) dies leaving some property, then that property is for his heirs
Reference: Bukhari 6731