Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:10930a –
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السيوطي:١٠٩٣٠a –

"الرَّجُلُ يَحْلفُ عَلَى اليَمينِ ثُمَّ يَسْتَثْنِى فِي نَفْسهِ لَيسَ ذَلكَ بشَيْءٍ حَتَّى يُظهِرَ الاسْتثناءَ كَمَا يُظهِرُ اليَمينَ".  

[ق] البيهقى في السنن عن أَبي هريرة

See similar narrations below:

Collected by Bayhaqī
bayhaqi:19932 – Abū Bakr b. al-Ḥārith al-Aṣbahānī > Abū Muḥammad b. Ḥayyān > Ibn Muṣʿab > ʿAbd al-Jabbār b. al-ʿAlāʾ > Marwān b. Muʿāwiyah > ʿAbdullāh b. Saʿīd al-Maqburī from his grandfather Abū Saʿīd > Abū Hurayrah

[Machine] The Messenger of Allah ﷺ said, "A person takes an oath by swearing to the right and then makes an exception in their own self. He said, 'There is no problem in that until the exception is made apparent, just as the right is made apparent.'"  

البيهقي:١٩٩٣٢ – أَخْبَرَنَاهُ أَبُو بَكْرِ بْنُ الْحَارِثِ الْأَصْبَهَانِيُّ أنبأ أَبُو مُحَمَّدِ بْنُ حَيَّانَ ثنا ابْنُ مُصْعَبٍ ثنا عَبْدُ الْجَبَّارِ بْنُ الْعَلَاءِ ثنا مَرْوَانُ بْنُ مُعَاوِيَةَ ثنا عَبْدُ اللهِ بْنُ سَعِيدٍ الْمَقْبُرِيُّ عَنْ جَدِّهِ أَبِي سَعِيدٍ عَنْ أَبِي هُرَيْرَةَ ؓ قَالَ

قَالَ رَسُولُ اللهِ ﷺ الرَّجُلُ يَحْلِفُ عَلَى الْيَمِينِ ثُمَّ يَسْتَثْنِي فِي نَفْسِهِ قَالَ لَيْسَ ذَلِكَ بِشَيْءٍ حَتَّى يَظْهَرَ الِاسْتِثْنَاءُ كَمَا يَظْهَرُ الْيَمِينُ