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.
ibnmajah:2114Sufyān b. Wakīʿ > Muḥammad b. Ḥumayd al-Maʿmarī > Maʿmar > Hammām > Abū Hurayrah

"If anyone of you insists on fulfilling what he swore to (after learning that it is wrong) then it is more sinful before Allah than (breaking the oath for which) the expiation that has been enjoined upon him."  

ابن ماجة:٢١١٤حَدَّثَنَا سُفْيَانُ بْنُ وَكِيعٍ حَدَّثَنَا مُحَمَّدُ بْنُ حُمَيْدٍ الْمَعْمَرِيُّ عَنْ مَعْمَرٍ عَنْ هَمَّامٍ قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ يَقُولُ قَالَ

أَبُو الْقَاسِمِ ﷺ إِذَا اسْتَلَجَّ أَحَدُكُمْ فِي الْيَمِينِ فَإِنَّهُ آثَمُ لَهُ عِنْدَ اللَّهِ مِنَ الْكَفَّارَةِ الَّتِي أُمِرَ بِهَا حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى حَدَّثَنَا يَحْيَى بْنُ صَالِحٍ الْوُحَاظِيُّ حَدَّثَنَا مُعَاوِيَةُ بْنُ سَلاَّمٍ عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ عَنْ عِكْرِمَةَ عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ نَحْوَهُ