This particular verses stood out very strongly for me. Weiz and Jia should know why.

When you make a vow to [Him], do not delay in fulfilling it. He has no pleasure in fools; fulfil your vow. It is better not to vow than to make a vow and not fulfil it. Do not let your mouth lead you into sin. And do not protest to the temple messenger, "My vow was a mistake." Why should [He] be angry at what you say and destroy the work of your hands?
Ecc 5