Easton's Bible Dictionary: Vows

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Vows
Voluntary promises which, when once made, were to be kept if the thing vowed was right. They were made under a great variety of circumstances (Genesis 28: 18-22; Leviticus 7:16; Numbers 30:2-13; Deuteronomy 23:18; Judges 11:30, 39; 1 Samuel 1:11; Jonah 1:16; Acts 18:18; 21:23).