The Importance of Keeping Vows
Ecclesiastes 5:4-7

Ecc 5:4 When thou vowest a vow unto God, defer not to pay it; for he hath no pleasure in fools: pay that which thou hast vowed.
Ecc 5:5 Better is it that thou shouldest not vow, than that thou shouldest vow and not pay.
Ecc 5:6 Suffer not thy mouth to cause thy flesh to sin; neither say thou before the angel, that it was an error: wherefore should God be angry at thy voice, and destroy the work of thine hands?
Ecc 5:7 For in the multitude of dreams and many words there are also divers vanities: but fear thou God.

Leviticus 5:4-6

Union Gospel Press
Believers Bible Commentary
esword.com
Matthew Henry Concise Commentary
https://www.biblestudytools.com/commentaries/matthew-henry-complete/
http://www.bible-studys.org/index