Sunan an Nasai
5474
Daif+2

It was narrated from Abu Sa'eed that:The Prophet [SAW] said: "A'udhu billahi minal-kufri wad-dain. (I seek refuge with Allah from Kufr and debt.)" A man said: "Are you equating debt with Kufr?" He said: "Yes

DaifAbu Ghuddah
DaifAl-Albani