وَلِأَبِي دَاوُدَ: مِنْ حَدِيثِ اِبْنِ عَبَّاسٍ مَرْفُوعاً: «مِنْ نَذَرَ نَذْراً لَمْ يُسَمِّهِ، فَكَفَّارَتُهُ كَفَّارَةُ يَمِينٍ، وَمَنْ نَذَرَ نَذْراً فِي مَعْصِيَةٍ، فَكَفَّارَتُهُ كَفَّارَةُ يَمِينٍ، وَمَنْ نَذَرَ نَذْراً لَا يُطِيقُهُ، فَكَفَّارَتُهُ كَفَّارَةُ يَمِينٍ» وَإِسْنَادُهُ صَحِيحٌ; إِلَّا أَنَّ اَلْحُفَّاظَ رَجَّحُوا وَقْفَهُ
“If anyone takes a vow but does not name it, its atonement is the same as that for an oath. If anyone takes a vow to do an act of disobedience, its atonement is the same as that for an oath. If anyone takes a vow which he is unable to fulfill, its atonement is the same as that for an oath.”.
Bulugh al-Maram 1568, Book 13, Oaths and Vows, Hadith 13. 1 min read