(18) And Jacob rose up early in the morning, and took the stone that he had put for his pillows, and set it up for a pillar, and poured oil upon the top of it.
(19) And he called the name of that place Beth-el: but the name of that city was called Luz at the first.
(20) 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.
(21) So that I come again to my father's house in peace; then shall the Lord be my God.
(22) And this stone, which I have set for a pillar, shall be God's house: and of all that thou shalt give me I will surely give the tenth unto thee.
ADDENDUM:
Jacob said to Jehovah God, "and of all that thou shalt give me, I will surely give the tenth unto thee." As Christians, is giving of the tenth unto God, a preference or an obligation to fulfill?