Sunan an-Nasa'i, Volume 5, Book 44, Hadith 4695 (DarusSalam) ⓘ
It was narrated that Abu Hurairah said: "The Messenger of Allah said: 'Wrongdoing is when a rich man takes a long time to repay a debt, and if one of you is referred to a rich man (to help repay debt), he should accept that referral."'
حَدَّثَنَا مُحَمَّدُ بْنُ سَلَمَةَ، وَالْحَارِثُ بْنُ مِسْكِينٍ، قِرَاءَةً عَلَيْهِ وَأَنَا أَسْمَعُ، وَاللَّفْظُ، لَهُ عَنِ ابْنِ الْقَاسِمِ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " مَطْلُ الْغَنِيِّ ظُلْمٌ وَإِذَا أُتْبِعَ أَحَدُكُمْ عَلَى مَلِيءٍ فَلْيَتْبَعْ " .
also referenced under: Hadith 4691 (Reference) & Book 44, Hadith 243 (In-Book)