The Book of Oaths and Vows
35/41. Chapter:
Expiation For Vows
Sunan an-Nasai
أَخْبَرَنَا هَارُونُ بْنُ مُوسَى الْفَرْوِيُّ، قَالَ حَدَّثَنَا أَبُو ضَمْرَةَ، عَنْ يُونُسَ، عَنِ ابْنِ شِهَابٍ، قَالَ حَدَّثَنَا أَبُو سَلَمَةَ، عَنْ عَائِشَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ نَذْرَ فِي مَعْصِيَةٍ وَكَفَّارَتُهَا كَفَّارَةُ الْيَمِينِ " .
It was narrated from 'Aishah that the Messenger of Allah said: "There is no vow to commit an act of disobedience, and its expiation is the expiation for an oath."
Reference : Sunan an-Nasa'i 3838In-book reference : Book 35, Hadith 78English translation : Vol. 4, Book 35, Hadith 3869