What does the Bible say about vows in relation to God?

In Ecclesiastes 5:4-5, it is stated that when you make a vow to God, do not delay in fulfilling it; for He has no pleasure in fools. Pay what you vow, as it is better not to make a vow than to make one and not fulfill it. This underscores the importance of taking vows seriously, as they represent a sacred promise made to God. Jephthah's vow, while seemingly misguided, reflects a significant commitment to God, which highlights the gravity of fulfilling promises made to the Lord. The repercussions of such vows reveal the weight of our commitments to God.