Numbers 30:1-2

In the first ages of the church, and even in later periods, some pious persons, out of an holy zeal for the LORD'S honor and glory, have obliged themselves to certain acts, either in doing or suffering, concluding thereby, that they did GOD service. In general it may be observed, that unless they are founded in divine grace, and conditionally promised in the aid of divine strength, they are unsuitable, and unbecoming poor, fallen, and sinful creatures; who in their best moments can assure themselves of nothing. See the case of Jepthah, Judges 11:30, with Judges 11:34. Hence that advice of Solomon, Ecclesiastes 5:4; Ecclesiastes 5:4. But there is a case where holy vows, formed in the grace of JESUS, and arising from a deep sense of his love in the heart, renders them sacred things. See the case of the Psalmist, Psalms 66:13.