Genesis 26:14-17

He had possessions of flocks and herds and many servants, so that the Philistines envied him. (Now the Philistines had stopped and filled with earth all the wells that his father’s servants had dug in the days of Abraham his father.) And Abimelech said to Isaac, “Go away from us, for you are much mightier than we.” So Isaac departed from there and encamped in the Valley of Gerar and settled there.