مشكوة المصابيح
Mishkat al-Masabih
كتاب البيوع
The Book of Sales and Trade
(عَدَمُ إِرْجَاعِ القَرْضِ مَعَ اليَسَارِ ظُلْمٌ)
(Not repaying a loan despite wealth is oppression)
Hadith 2907
وَعَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَطْلُ الْغَنِيِّ ظُلْمٌ فَإِذَا أُتْبِعَ أحدكُم على مَلِيء فَليتبعْ»
He reported God's Messenger as saying, “Delay in payment by a rich man is injustice, but when one of you is referred for payment to a wealthy* man he should accept the reference." (Bukhari and Muslim.) *Mali'. This word is used of a wealthy man, and also of one who cannot be called wealthy but who is careful to pay his debts.
