Charles Ellicott Commentary Genesis 31:43

"And Laban answered and said unto Jacob, The daughters are my daughters, and the children are my children, and the flocks are my flocks, and all that thou seest is mine: and what can I do this day unto these my daughters, or unto their children whom they have borne?" — Genesis 31:43 (ASV)

Laban answered ... — Laban does not attempt any reply to Jacob’s angry invectives, but answers affectionately. Why should he wish to injure Jacob and send him away empty? All that Jacob had was still Laban’s in the best of senses; for were Rachel and Leah not his daughters? And were their children not his grandsons? How was it possible that he could wish to rob them?

He proposes, therefore, that they should make a covenant, by which Jacob should bind himself to deal kindly with his daughters and to take no other wife; while Laban promises for himself that he would do Jacob no wrong. Jacob therefore sets up a large stone as a pillar and memorial, and Laban subsequently does the same. Then, probably between the two hills on which they had separately encamped (Genesis 31:25), they collect a large mass of other stones, on which they feast together in token of friendship (Genesis 26:30).