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Abu Musa reported the Prophet (ﷺ) as saying, “The greatest sin in God's sight, after the serious sins which God has prohibited, which a man can bring into His presence is that he should die in debt without leaving enough to discharge it.” Ahmad and Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي مُوسَى عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِنَّ أَعْظَمَ الذُّنُوبِ عِنْدَ اللَّهِ أَنْ يَلْقَاهُ بِهَا عَبْدٌ بَعْدَ الْكَبَائِرِ الَّتِي نَهَى اللَّهُ عَنْهَا أَنْ يَمُوتَ رَجُلٌ وَعَلَيْهِ دَيْنٌ لَا يَدَعُ لَهُ قَضَاءً» . رَوَاهُ أَحْمد وَأَبُو دَاوُد
sunnah.com