Genesis 26:15-18

15So they took dirt from the ground and they filled up Isaac's wells. When Abraham was alive, his servants had dug these wells to get water.

16Abimelech said to Isaac ‘You have become too powerful for us. Go and live somewhere else.’

17So Isaac moved away from that place. He put his tents in the Valley of Gerar and he stayed there.

18Isaac dug the dirt out of the wells that Abraham had dug. After Abraham died the Philistines had filled them with dirt. Isaac gave these wells the same names as his father had given them.