It was narrated that 'Abdullah bin 'Umar said:
"The Messenger of Allah (ﷺ) forbade vows and said: 'They are just a means of taking wealth from the miserly."' (FR)
English reference (FR): Vol. 3, Book 11, Hadith 2122 (FR)
Arabic reference (FR): Book 11, Hadith 2203 (FR)