Ṣaḥīḥ reporting in supplication and praising Allah the almighty

«اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْمَأْثَمِ، وَالْمَغْرَمِ»
{وهو دعاء يُشرع قوله في التشهد الأخير قبل السلام}

Allahumma innī a‘ūdhu bika mina l-ma’thami, wa l-maghram

“O Allah, I seek refuge in You from committing sin that incurs guilt, and from falling into debt.”

(This supplication is recommended during the final Tashahhud, before finishing prayer by doing the Tasleem.)