It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: Making a vow does not bring anything forward or push anything back, but by making a vow something comes out from a miserly person.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5994