Imam Maalik مالك بن أنس بن مالك بن أبي عامر · Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)

The Messenger of Allah (ﷺ) forbade to make a vow. He said: It has not effect against fate, it is only from the miserly that it is means by which something is extracted. Musaddad said: The Messenger of Allah (ﷺ) said: A vow does not avert anything (i.e. has no effect against fate).

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.