Genesis 26:14-17

for he had possessions of flocks and possessions of herds and a great number of servants. So the Philistines envied him. Now the Philistines had stopped up all the wells which his father’s servants had dug in the days of Abraham his father, and they had filled them with earth. And Abimelech said to Isaac, “Go away from us, for you are much mightier than we.” Then Isaac departed from there and pitched his tent in the Valley of Gerar, and dwelt there.