Early the next morning, Jacob took the stone that he had placed under his head, and he set it up as a pillar. He poured oil on top of it,
18. And Jacob rose up early. Moses relates that the holy father was not satisfied with merely giving thanks at the time, but would also transmit a memorial of his gratitude to posterity. Therefore he raised a monument, and gave a name to the place, which implied that he thought such a signal benefit of God worthy to be celebrated in all ages.
God manifested himself and his favour to Jacob when he was asleep and purely passive; for the spirit, like the wind, blows when and where he listeth, and God's grace, like the dew, tarrieth not for the sons of men, Mic 5:7.
Commenting on Genesis 28:16-22
And Jacob rose up early in the morning,.... In order to proceed on his journey, being comfortably refreshed both in body and mind: but first he took the stone that he had put for his pillows, and set it up for a pillar; not for a statue or an idol to be worshipped, but for a memorial of the mercy and goodness of God unto...