Genesis 26:17-19

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.

19Also Isaac’s servants dug in the valley, and found a well of running water there.