Sahih al-Bukhari 2400
Book 43: Loans, Payment of Loans, Freezing of Property, Bankruptcy · Narrated by Abu Huraira
Arabic
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا عَبْدُ الأَعْلَى، عَنْ مَعْمَرٍ، عَنْ هَمَّامِ بْنِ مُنَبِّهٍ، أَخِي وَهْبِ بْنِ مُنَبِّهٍ أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ ـ رضى الله عنه ـ يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَطْلُ الْغَنِيِّ ظُلْمٌ ".
English translation
Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "Procrastination (delay) in repaying debts by a wealthy person is injustice
Reference: Sahih al-Bukhari 2400, Book of Loans, Payment of Loans, Freezing of Property, Bankruptcy. English translation by Dr. Muhammad Muhsin Khan.