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[Machine] On the authority of the Prophet ﷺ , he said: "Whoever swears an oath to someone while knowing that he will not fulfill it, then the sin of that oath is upon the one who did not fulfill it."  

البيهقي:١٩٨٩١ – أَخْبَرَنَا أَبُو بَكْرِ بْنُ الْحَارِثِ الْفَقِيهُ أنبأ عَلِيُّ بْنُ عُمَرَ الْحَافِظُ ثنا عَلِيُّ بْنُ الْحَسَنِ بْنِ هَارُونَ بْنِ رُسْتُمَ ثنا مُحَمَّدُ بْنُ عَبْدِ الْمَلِكِ الدَّقِيقِيُّ ثنا يَزِيدُ بْنُ هَارُونَ ثنا بَقِيَّةُ ثنا إِسْحَاقُ بْنُ مَالِكٍ الْحَضْرَمِيُّ عَنْ عِكْرِمَةَ عَنْ أَبِي هُرَيْرَةَ ؓ

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ حَلَفَ عَلَى أَحَدٍ بِيَمِينٍ وَهُوَ يَرَى أَنَّهُ سَيَبَرُّهُ فَلَمْ يَفْعَلْ فَإِنَّمَا إِثْمُهُ عَلَى الَّذِي لَمْ يَبَرَّهُ  

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Collected by Suyūṭī
suyuti:21415a –
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السيوطي:٢١٤١٥a –

"مَنْ حَلَفَ عَلَى أَحَد بِيَمِين وَهُوَ يَرَى أَنَّهُ سَيَبَرُّ بِهِ فَلَمْ يَفْعَلْ فَإِنَّمَا إِثْمُهُ عَلَى الَّذِي لَمْ يَبَرَّهُ".  

[ق] البيهقى في السنن وضعَّفه، عن أبي هريرة