Muwatta Malik 1369

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 from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "Delay in payment by a rich man is injustice, but when one of you is referred for payment to a wealthy man, let him be referred

Reference

Muwatta Malik 1369

In-book

Book 31, Hadith 31