And Jacob vowed a vow, saying, If God will be with me, and will keep me in this way that I go, and will give me bread to eat, and raiment to put on, Vowed a vow - A vow is a solemn, holy promise, by which a man bound himself to do certain things in a particular way, time, etc., and for power to accomplish which he depended on God; hence all vows were made with prayer.
If God will be with me, etc. - Jacob seems to make this vow rather for his posterity than for himself, as we may learn from Genesis 28:13-15; for he particularly refers to the promises which God had made to him, which concerned the multiplication of his offspring, and their establishment in that land. If, then, God shall fulfill these promises, he binds his posterity to build God a house, and to devote for the maintenance of his worship the tenth of all their earthly goods. This mode of interpretation removes that appearance of self-interest which almost any other view of the subject presents. Jacob had certainly, long ere this, taken Jehovah for his God; and so thoroughly had he been instructed in the knowledge of Jehovah, that we may rest satisfied no reverses of fortune could have induced him to apostatize: but as his taking refuge with Laban was probably typical of the sojourning of his descendants in Egypt, his persecution, so as to be obliged to depart from Laban, the bad treatment of his posterity by the Egyptians, his rescue from death, preservation on his journey, re-establishment in his own country, etc., were all typical of the exodus of his descendants, their travels in the desert, and establishment in the promised land, where they built a house to God, and where, for the support and maintenance of the pure worship of God, they gave to the priests and Levites the tenth of all their worldly produce. If all this be understood as referring to Jacob only, the Scripture gives us no information how he performed his vow.