Sahih Muslim Book 26, Hadith 5

It does not (necessarily) bring good (in the form of substantial, and tangible results), but it is the meant whereby something is extracted from the miserly persons.

Previous Hadith

The vow neither hastens anything nor defers anything, but is the means whereby (something) is extracted from the miserly person.

Sahih Muslim Book 26, Hadith 4
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This hadith has been narrated on the authority of Mansur with the same chain of transmitters.

Sahih Muslim Book 26, Hadith 6