Sayyiduna ‘Ali (radiyallahu’anu) said that Rasulullah (sallallahu ‘alaihi wasallam) prescribed the following du’a for the settling of debts:
اللهُمَّ اكْفِنِي بِحَلالِكَ عَنْ حَرامكْ، وَأَغْنِني بِفَضْلِكَ عَمَّنْ سِواك
‘Allahummak finee bi halalika an haramik wa aghninee bi fadhlika amman siwak.’
Translation: O Allah! Let the Halal things you provide suffice me from haram, and by Your Grace, keep me independent from all besides You.
(Sunan Tirmidhi – Imam Tirmidhi rahimahullah has classified this narration as hasan (sound) – hadith 3563.)