Narrated Ziyad bin Jubair:
A man went to Ibn `Umar I. and said, "A man vowed to fast one day (the sub-narrator thinks that he said that the day was Monday), and that day happened to be `Id day." Ibn `Umar said, "Allah orders vows to be fulfilled and the Prophet (ﷺ) forbade the fasting on this day (i.e. Id).
Reference | : Sahih al-Bukhari 1994 |
In-book reference | : Book 30, Hadith 100 |
USC-MSA web (English) reference | : Vol. 3, Book 31, Hadith 214 |
(deprecated numbering scheme) |