Genesis 26:15

Overview - Genesis 26
Isaac, because of famine, sojourns in Gerar, and the Lord instructs and blesses him.
He is reproved by Abimelech for denying his wife.
12 He grows rich, and the Philistines envy his prosperity.
18 He digs Esek, Sitnah, and Rehoboth.
23 God appears to him at Beer-sheba, and blesses him; and Abimelech makes a covenant with him.
34 Esau's wives.
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Genesis 26:15  (King James Version)
For all the wells which his father's servants had digged in the days of Abraham his father, the Philistines had stopped them, and filled them with earth.

his father's

had stopped
In those countries, a well of water was a great acquisition; and hence, this mode of injuring new settlers, or revenging themselves on their enemies, is still resorted to among the inhabitants.