The Messenger of Allah (ﷺ) as saying: A vow does not provide for the son of Adam anything which I did not decree for him, but a vow draws it. A Divine decree is one which I have destined, it is extracted from a miser. He is given what he was not given before.
Reference: Sunan Abi Dawud 3288 In-book : Book 22, Hadith 47 English translation : Book 21, Hadith 3282
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