Genesis 31:44-49

Let us make an agreement, and let us set up a pile of stones to remind us of it.” So Jacob took a large rock and set it up on its end. He told his relatives to gather rocks, so they took the rocks and piled them up; then they ate beside the pile. Laban named that place in his language A Pile to Remind Us, and Jacob gave the place the same name in Hebrew. Laban said to Jacob, “This pile of rocks will remind us of the agreement between us.” That is why the place was called A Pile to Remind Us. It was also called Mizpah, because Laban said, “Let the LORD watch over us while we are separated from each other.