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[Machine] The Messenger of Allah, ﷺ , used to say: "Whoever swears an oath and then says 'Insha Allah' after it, and then breaks his oath, the expiation for his oath is upon Allah, if He wills."  

البيهقي:١٩٩٢٥ – وَقَدْ أَخْبَرَنَا أَبُو مُحَمَّدٍ الْحَسَنُ بْنُ عَلِيِّ بْنِ الْمُؤَمَّلِ ثنا أَبُو عُثْمَانَ الْبَصْرِيُّ ثنا مُحَمَّدُ بْنُ إِسْمَاعِيلَ أَبُو بَكْرٍ ثنا عَبْدُ الْمَلِكِ بْنُ شُعَيْبِ بْنِ اللَّيْثِ حَدَّثَنِي أَبِي عَنْ جَدِّي حَدَّثَنِي الْهِقْلُ بْنُ زِيَادٍ عَنِ الْأَوْزَاعِيِّ عَنْ دَاوُدَ بْنِ عَطَاءٍ رَجُلٍ مِنْ أَهْلِ الْمَدِينَةِ قَالَ حَدَّثَنِي مُوسَى بْنُ عُقْبَةَ حَدَّثَنِي نَافِعٌ عَنْ عَبْدِ اللهِ بْنِ عُمَرَ ؓ أَنَّ

رَسُولَ اللهِ ﷺ كَانَ يَقُولُ مَنْ حَلَفَ عَلَى يَمِينٍ فَقَالَ فِي أَثَرِ يَمِينِهِ إِنْ شَاءَ اللهُ ثُمَّ حَنِثَ فِيمَا حَلَفَ فِيهِ فَإِنَّ كَفَّارَةَ يَمِينِهِ إِنْ شَاءَ اللهُ  

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Collected by Suyūṭī
suyuti:21417a –
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السيوطي:٢١٤١٧a –

"مَنْ حَلَفَ عَلَى يَمِينٍ فَقَال في إِثْرِ يَمِينِهِ: إِنْ شَاءَ اللهُ، ثُمَّ حَنِث فِيمَا حَلَفَ فِيهِ، فَإِنَّ كَفَّارَةَ يَمِينِهِ إِنْ شَاءَ اللهُ".  

[ق] البيهقى في السنن عن ابن عمر