Mishkat al-Masabih #3309
Oaths and Vows
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
عَن عِمْرَانَ بْنِ حُصَيْنٍ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ:
" النَّذْرُ نَذْرَانِ: فَمَنْ كَانَ نَذَرَ فِي طَاعَةٍ فَذَلِكَ لِلَّهِ فِيهِ الْوَفَاءُ وَمَنْ كَانَ نَذَرَ فِي مَعْصِيَةٍ فَذَلِكَ لِلشَّيْطَانِ وَلَا وَفَاء فِيهِ وَيُكَفِّرُهُ مَا يُكَفِّرُ الْيَمِينَ ". رَوَاهُ النَّسَائِيُّ
‘Imran b. Husain told that he heard God’s Messenger say, “Vows are of two kinds, so if anyone vows to do an act of obedience, that is for God and must be fulfilled; but if anyone vows, to do an act of disobedience, that is for the devil and must not be fulfilled, but he must make atonement for it to the extent he would do in the case of an oath.”
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About Mishkat al-Masabih
This hadith is #3309 from Mishkat al-Masabih, in the Book of Oaths and Vows.