‏البيوع : Hadeeth No:3796 Abu Huraira (Allaah be pleased with him) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Delay (in the payment of debt) on the part of a rich man is injustice, and when one of you is retired to a rich man, he should follow him....

‏الحج : Hadeeth No:3109 A hadith like this has been narrated by A'mash with the same chain of transmitters....