Genesis 31:52

“This heap [be] witness, etc.] Agreeably to its name, which both he and Jacob gave unto it: and [this] pillar [be] witness: which was set up for the same purpose: that I will not pass over this heap to thee, and that thou shalt not pass over this heap and this pillar unto me, for harm; not that these were to be the boundaries of their respective countries; for neither of them at present were possessed of lands that reached hither, if of any at all; nor that it would be a breach of covenant to pass over or by those, from one country into another, but so as to do, or with an intent to do, hurt to each other.”

“This heap be witness--Objects of nature were frequently thus spoken of. But over and above, there was a solemn appeal to God; and it is observable that there was a marked difference in the religious sentiments of the two. Laban spake of the God of Abraham and Nahor, their common ancestors; but Jacob, knowing that idolatry had crept in among that branch of the family, swore by the "fear of his father Isaac." They who have one God should have one heart: they who are agreed in religion should endeavor to agree in everything else. Next: Genesis Chapter 32”