alkafi-14632Vol. 7, p. 438-439
الْأَيْمَانُ ثَلَاثٌ يَمِينٌ لَيْسَ فِيهَا كَفَّارَةٌ وَ يَمِينٌ فِيهَا كَفَّارَةٌ وَ يَمِينٌ غَمُوسٌ تُوجِبُ النَّارَ فَالْيَمِينُ الَّتِي لَيْسَ فِيهَا كَفَّارَةٌ الرَّجُلُ يَحْلِفُ بِاللَّهِ عَلَى بَابِ بِرٍّ أَنْ لَا يَفْعَلَهُ فَكَفَّارَتُهُ أَنْ يَفْعَلَهُ وَ الْيَمِينُ الَّتِي تَجِبُ فِيهَا الْكَفَّارَةُ الرَّجُلُ يَحْلِفُ عَلَى بَابِ مَعْصِيَةٍ أَنْ لَا يَفْعَلَهُ فَيَفْعَلُهُ فَتَجِبُ عَلَيْهِ الْكَفَّارَةُ
“Abu ‘Abd Allah (a.s.), has said, ‘Swearing is of three kinds. There is one kind of swearing, which does not require expiation, the kind that requires expiation, and the false swearing which causes the fire. The kind, which does not require expiation, is the swearing in which one has sworn by Allah for a good cause not