Genesis 26:15-18

15Now 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.

16And Abimelech said to Isaac, “Go away from us, for you are much mightier than we.”

17Then Isaac departed from there and pitched his tent in the Valley of Gerar, and dwelt there.

18And Isaac dug again the wells of water which they had dug in the days of Abraham his father, for the Philistines had stopped them up after the death of Abraham. He called them by the names which his father had called them.