Jami' al-Saghir / Jam' al-Jawami' (al-Suyuti) 23601a
"مِنْ أَكبَرِ الْكَبائِر: الشِّرْكُ بِاللهِ، وَعُقُوقُ الْوَالِدَين، وَالْيَمِينُ الْغَمُوسُ، وَمَا حَلَفَ حَالفٌ بِاللهِ يَمِينَ صَبْرٍ فَأَدْخَل فِيهَا مِثْلَ جَنَاحِ الْبَعُوضَةِ، إِلا كَانَتْ عَلَيهِ نُكْتَةً في قَلبِهِ يَوْمَ الْقِيَامَة".
Translation
Machine translation, not reviewed
"Among the greatest major sins: associating partners with Allah, disobedience to parents, and the perjurious oath. Whoever swears by Allah a deliberate oath, by which he takes even the wing of a mosquito, a spot will be placed upon his heart on the Day of Resurrection."
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Notes
[هب] البيهقى في شعب الإيمان عن عبد الله بن أنيس
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