The Messenger of Allah (ﷺ) used to recite this supplication in the prayer:
اَللَّهُمَّ إِنِّي أَعُوْذُ بِكَ مِنْ عَذَابِ الْقَبْرِ، وَأَعُوْذُ بِكَ مِنْ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ، وَأَعُوْذُ بِكَ مِنْ فِتْنَةِ الْمَحْـيَا وَالْمَمَاتِ. اَللَّهُمَّ إِنِّي أَعُوْذُ بِكَ مِنَ الْمَأْثَمِ وَالْمَغْرَمِ
Pronunciation
Allaahumma 'innee 'a'oodhu bika min 'adhaabil-qabr, wa 'a'oodhu bika min fitnatil-maseehid-dajjaal, wa 'a'oodhu bika min fitnatil-mahyaa wal-mamaat. Allaahumma 'innee 'a'oodhu bika minal-ma'thami wal-maghram
Meaning
O Allah, I seek refuge in You from the punishment of the grave, and I seek refuge in You from the trial of the False Messiah, and I seek refuge in You from the trials of life and death. O Allah, I seek refuge in You from sin and from debt. One asks him (the Prophet [ﷺ]), "Why do you seek so much refuge (from Allah) in debt?" In reply, the Prophet (ﷺ) said, "When a person is in debt, he lies when he speaks and breaks his promise.
Source: Bukhari: 832
Read the hadith
حَدَّثَنَا أَبُو الْيَمَانِ، قَالَ أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنَا عُرْوَةُ بْنُ الزُّبَيْرِ، عَنْ عَائِشَةَ، زَوْجِ النَّبِيِّ صلى الله عليه وسلم أَخْبَرَتْهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَدْعُو فِي الصَّلاَةِ " اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ، وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْمَحْيَا وَفِتْنَةِ الْمَمَاتِ، اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْمَأْثَمِ وَالْمَغْرَمِ ". فَقَالَ لَهُ قَائِلٌ مَا أَكْثَرَ مَا تَسْتَعِيذُ مِنَ الْمَغْرَمِ فَقَالَ " إِنَّ الرَّجُلَ إِذَا غَرِمَ حَدَّثَ فَكَذَبَ، وَوَعَدَ فَأَخْلَفَ ". وَعَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي عُرْوَةُ، أَنَّ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَسْتَعِيذُ فِي صَلاَتِهِ مِنْ فِتْنَةِ الدَّجَّالِ
Narrated `Aisha: (the wife of the Prophet) Allah's Messenger (ﷺ) used to invoke Allah in the prayer saying "Allahumma inni a`udhu bika min `adhabi l-qabr, wa a`udhu bika min fitnati l-masihi d-dajjal, wa a`udhu bika min fitnati l-mahya wa fitnati l-mamat. Allahumma inni a`udhu bika mina l-ma'thami wa l-maghram. (O Allah, I seek refuge with You from the punishment of the grave, from the afflictions of the imposter- Messiah, and from the afflictions of life and death. O Allah, I seek refuge with You from sins and from debt)." Somebody said to him, "Why do you so frequently seek refuge with Allah from being in debt?" The Prophet (ﷺ) replied, "A person in debt tells lies whenever he speaks, and breaks promises whenever he makes (them)." `Aisha also narrated: I heard Allah's Messenger (ﷺ) in his prayer seeking refuge with Allah from the afflictions of Ad-Dajjal. [Bukhari: 832]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset