"The Messenger of Allah (ﷺ) forbade vows and said: 'They are just a means of taking wealth from the miserly."'
Sunan Ibn Majah Book 11, Hadith 33
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Sunan Ibn Majah Book 11, Hadith 32 Next Hadith → "Vows do not bring the son of Adam anything unless it has been decreed for him. But he is dominated by Divine preordainment, and will get what is decreed for him. And (vows) are a means of making the miser give something, so what he desires becomes obtainable for him, which was not obtainable before his vow. And Allah says: 'Spend, I will spend on you.'

Sunan Ibn Majah Book 11, Hadith 34