Sunan at-Tirmithiy كتاب البيوع باب ما جاء فى مطل الغنى أنه ظلم
The Prophet, peace and blessings of God be upon him, said, "Procrastination (delay) in paying debts by a wealthy person is injustice; and if your debt is transferred (by the debtor) to a rich debtor (1), you should agree." Footnotes: (1) Debt Transfer is legitimate in Islam. Click on ḥadīth to read more