Ecclesiastes 5:2-3
2. Do not be quick with your mouth, do not be hasty in your heart to utter anything before God. God is in heaven and you are on earth, so let your words be few.
4. When you make a vow to God, do not delay to fulfill it. He has no pleasure in fools; fulfill your vow.
5. It is better not to make a vow than to make one and not fulfill it.
6. Do not let your mouth lead you into sin. And do not protest to the temple messenger, “My vow was a mistake.” Why should God be angry at what you say and destroy the work of your hands?