The Prophet [SAW] said: "A'udhu billahi minal-kufri wad-dain. (I seek refuge with Allah from Kufr and debt.)" A man said: "Are you equating debt with Kufr?" He said: "Yes."
عَنِ النَّبِيِّ ﷺ قَالَ أَعُوذُ بِاللَّهِ مِنَ الْكُفْرِ وَالدَّيْنِ فَقَالَ رَجُلٌ تَعْدِلُ الدَّيْنَ بِالْكُفْرِ قَالَ نَعَمْ