genesis 31:52 This heap be witness, and this pillar be witness, 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. - Free Bible Online

      52. 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.

JFB.