(16) باب الاِسْتِعَاذَةِ مِنَ الْفَقْرِ
Muslim - meaning bin Abi Bakrah - narrated that:
He heard his father say following the prayer: "Allahumma inni a'udhu bika minal-kufri wal-faqri, wa 'adhabil-qabri (O Allah, I seek refuge with You from Kufr, poverty and the torment of the grave.)" I started to recite them and he said: "O my son, where did you learn these words?" I said: "O my father, I heard you saying this supplication at the end of the prayer, and I learned them from you." He said: "Continue to recite them, O my son, for the Prophet of Allah [SAW] used to say this supplication at the end of the prayer."
Reference: Sunan an-Nasa'i 5465
In-book reference: Book 50, Hadith 38
English translation: Vol. 6, Book 50, Hadith 5467