Genesis 26:12-18

Isaac planted seed in that land, and that year he gathered a great harvest. The LORD blessed him very much, and he became rich. He gathered more wealth until he became a very rich man. He had so many slaves and flocks and herds that the Philistines envied him. So they stopped up all the wells the servants of Isaac’s father Abraham had dug. (They had dug them when Abraham was alive.) The Philistines filled those wells with dirt. And Abimelech said to Isaac, “Leave our country because you have become much more powerful than we are.” So Isaac left that place and camped in the Valley of Gerar and lived there. Long before this time Abraham had dug many wells, but after he died, the Philistines filled them with dirt. So Isaac dug those wells again and gave them the same names his father had given them.