Genesis 28:22

22.And this stone which I have set for a pillar. This ceremony was an appendage to divine worship; for external rites do not make men true worshippers of God, but are only aids to piety. But because the holy fathers were then at liberty to erect altars wherever they pleased, Jacob poured a libation upon the stone, because he had then no other sacrifice to offer; not that he worshipped God according to his own will, (for the direction of the Spirit was instead of the written law,) but he erected in that place a stone — as he was permitted to do by the kindness and permission of God, which should be a testimony of the vision. Moreover, this form of speech, that the stone shall be Beth-el, is metonymical; as we are sanctioned, by common usage, to transfer to external signs what properly belongs to the things represented. I have lately shown how ignorantly posterity has abused this holy exercise of piety. What next follows respecting the offering of tithes, is not a simple ceremony, but has a duty of charity annexed; for Jacob enumerates, in a threefold order, first, the spiritual worship of God; then the external rite, by which he both assists his own piety, and makes profession of it before men; in the third place, an oblation, by which he exercises himself in giving friendly aid to his brethren; for there is no doubt that tithes were applied to that use.