Sunan Abu Dawud
3345
Sahih+3

Narrated Abu Hurairah:The Messenger of Allah (ﷺ) as saying: Delay in payment (of debt) by a rich man is injunctive, but when one of you is referred to a wealthy man, he should accept the reference

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid