It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) 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 collect a debt), he should accept that referral." (RU)
English reference (RU): Vol. 3, Book 15, Hadith 2403 (RU)
Arabic reference (RU): Book 15, Hadith 2495 (RU)