حَدَّثَنَا يَحْيَى، عَنْ مَالِكٍ، 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 ‏"‏ ‏.‏

Yahya related to me from Malik from Abu'z-Zinad from al Araj fromAbu Hurayra that the Messenger of Allah, may Allah bless him and granthim peace, said, "Delay in payment by a rich man is injustice, butwhen one of you is referred for payment to a wealthy man, let him bereferred." Translation Not Available

Book Ref: Muwatta Imam Malik Book 31 Hadith 1372
Web Ref:  Muwatta Imam Malik Book 31 Hadith 85