Sahih Bukhari Volume 001, Book 012, Hadith Number 795.
Narated By 'Aisha : (The wife of the Prophet) Allah's Apostle used to invoke Allah in the prayer saying "Allahumma inni a'udhu bika min adhabil-qabri, wa a'udhu bika min fitnatil-masihid-dajjal, wa a'udhu bika min fitnatil-mahya wa fitnatil-mamati. Allahumma inni a'udhu bika minal-ma thami wal-maghrami. (O Allah, I seek refuge with You from the punishment of the grave and from the afflictions of Masi,h Ad-Dajjal and from the afflictions of life and death. O Allah, I seek refuge with You from the sins and from being in debt)." Somebody said to him, "Why do you so frequently seek refuge with Allah from being in debt?" The Prophet replied, "A person in debt tells lies whenever he speaks, and breaks promises whenever he makes (them)." 'Aisha also narrated: I heard Allah's Apostle in his prayer seeking refuge with Allah from the afflictions of Ad-dajjal.