Narrated `Abdullah bin `Umar: The Prophet forbade the making of vows and said, "It (a vow) does not prevent anything (that has to take place), but the property of a miser is spent (taken out) with it."
Hadith ReferenceSahih Bukhari / The Book of Oaths and Vows / Hadith: 6693
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة