What does Genesis 31:51 mean?
The previous verses have described in detail the building of and naming of both the pillar and heap—or "cairn"—of stones. It has been stated quite clearly that the pile of stones is meant to serve as a witness of the covenant between Laban and Jacob. This covenant is meant to establish a formal, peaceful separation between the two men. Jacob has served Laban for some twenty years, enduring hard work in addition to Laban's outrageous acts of fraud and cheating. Comically, Laban has invoked God as a witness to Jacob's conduct in the future, as if Jacob, and not Laban, has shown a preference for greed over family over the last two decades.Now Laban calls Jacob's attention to both the pillar and the heap once more. He is about to spell out in detail what the two of them are agreeing to. In short, this stone formation marks a boundary between them—neither will cross that spot with intent to do harm to the other. As long as they remain separated, they will be at peace.