They said, “We see plainly that YHVH has been with you. So we said, let there be a sworn pact between us, between you and us, and let us make a covenant with you, that you will do us no harm, just as we have not touched you and have done to you nothing but good and have sent you away in peace. You are now the blessed of YHVH.”
Genesis 26:28-29

The Philistines recognized Isaac's special relationship with God and they feared him for it. Fear often manifests as acts of hostility. Consider the ongoing conflict today between #israel and her neighbors.