Genesis 26:12-15

Then Isaac sowed in that land, and reaped in the same year a hundredfold; and the LORD blessed him. The man began to prosper, and continued prospering until he became very prosperous; 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.