Mukhtasar Sahih Bukhari — Hadith 1060

Narrated by Sayyiduna Abu Hurairah (may Allah be pleased with him) from the Prophet Muhammad (peace and blessings be upon him) that he said: "Delaying the payment of dues (such as debt, etc.) by a wealthy person is injustice, and if someone is referred to a wealthy person (i.e., the debt is transferred to him), then he should accept it, i.e., follow up with him."