And Jacob vowed a vow, saying, If {h} 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,

(h) He does not bind God under this condition, but acknowledges his infirmity, and promises to be thankful.

Wesley's Notes

28:20 And Jacob vowed a vow - By religious vows we give glory to God, and own our dependance upon him, and we lay a bond upon our own souls, to engage and quicken our obedience to him. Jacob was now in fear and distress, and in times of trouble it is seasonable to make vows, or when we are in pursuit of any special mercy, Jon 1:16 Psa 66:13,14 1Sam 1:11 Num 21:1,2,3. Jacob had now had a gracious visit from heaven, God had renewed his covenant with him, and the covenant is mutual; when God ratifies his promises to us, it is proper for us to repeat our promises to him. If thou wilt be with me and keep me - We need desire no more to make us easy and happy wherever we are, but to have God's presence with us, and to be under his protection. It is comfortable in a journey to have a guide in an unknown way, a guard in a dangerous way, to be well carried, well provided for, and to have good company in any way; and they that have God with them, have all this in the best manner. Then shall the Lord be my God - Then I will rejoice in him as my God, then I will be the more strongly engaged to abide with him. And this pillar shall be God's house - That is, an altar shall be erected here to the honour of God. And of all that thou shalt give me I will surely give the tenth unto thee - To be spent either upon God's altar or upon his poor, which are both his receivers in the world. The tenth is a very fit proportion to be devoted to God, and employed for him; though as circumstances vary, it may be more or less, as God prospers us.

Jamieson-Fausset-Brown Bible Commentary

Ge 28:20-22. Jacob's Vow.

20. Jacob vowed a vow-His words are not to be considered as implying a doubt, far less as stating the condition or terms on which he would dedicate himself to God. Let "if" be changed into "since," and the language will appear a proper expression of Jacob's faith-an evidence of his having truly embraced the promise. How edifying often to meditate on Jacob at Beth-el.

Matthew Henry's Concise Commentary

28:20-22 Jacob made a solemn vow on this occasion. In this observe, 1. Jacob's faith. He trusts that God will be with him, and will keep him; he depends upon it. 2. Jacob's moderation in his desires. He asks not for soft clothing and dainty meat. If God give us much, we are bound to be thankful, and to use it for him; if he gives us but little, we are bound to be content, and cheerfully to enjoy him in it. 3. Jacob's piety, and his regard to God, appear in what he desired, that God would be with him, and keep him. We need desire no more to make us easy and happy. Also his resolution is, to cleave to the Lord, as his God in covenant. When we receive more than common mercy from God, we should abound in gratitude to him. The tenth is a fit proportion to be devoted to God, and employed for him; though it may be more or less, as God prospers us, 1Co 16:2. Let us then remember our Bethels, how we stand engaged by solemn vows to yield ourselves to the Lord, to take him for our God, and to devote all we have and are to his glory!