Riyad as-Salihin 1486

Translation

'Ali (May Allah be pleased with him) reported: A slave who had made a contract with his master to pay for his freedom, came to me and said: "I am unable to fulfill my obligation, so help me." He said to him: "Shall I not teach you a supplication which the Messenger of Allah (PBUH) taught me? It will surely prove so effective that if you have a debt as large as a huge mountain, Allah will surely pay it for you. Say: 'Allahumm-akfini bihalalika 'an haramika, wa aghnini bifadlika 'amman siwaka (O Allah! Grant me enough of what You make lawful so that I may dispense with what You make unlawful, and enable me by Your Grace to dispense with all but You)." [At- Tirmidhi].

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Same hadith, other wordings

• Hisnul Muslim 136اللّهُـمَّ اكْفِـني بِحَلالِـكَ عَنْ حَـرامِـك، وَأَغْنِـني بِفَضْـلِكَ عَمَّـنْ سِـواك
• Misykatul Mashabih 2449وَعَن عليّ: أَنَّهُ جَاءَهُ مُكَاتَبٌ فَقَالَ: إِنِّي عَجَزْتُ عَنْ كتابي فَأَعِنِّي قَالَ: أَلَا أُعَلِّمُكَ كَلِمَاتٍ عَلَّمَنِيهِنَّ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَوْ كَانَ عَلَيْكَ مِثْلُ جَبَلٍ كَبِيرٍ دَيْنًا أَدَ
• Jami at-Tirmidzi 3563أَنَّ مُكَاتَبًا جَاءَهُ فَقَالَ إِنِّي قَدْ عَجَزْتُ عَنْ كِتَابَتِي فَأَعِنِّي قَالَ أَلاَ أُعَلِّمُكَ كَلِمَاتٍ عَلَّمَنِيهِنَّ رَسُولُ اللَّهِ ﷺ لَوْ كَانَ عَلَيْكَ مِثْلُ جَبَلِ صِيرٍ دَيْنًا أَدَّاهُ اللَّهُ عَنْكَ قَالَ قُلِ اللَّهُم