Genesis 26:15

The wells. — In the East the digger of a well is regarded as a public benefactor; but the Philistines stopped those that Abraham had digged, probably because they regarded his possession of them, though confirmed by the covenant between him and Abimelech (Genesis 21:32), as an intrusion upon their rights as the people of the country, Envious, too, at the rapid increase of an alien’s wealth, they determined to drive Isaac away; and for this no expedient would be more effectual than the preventing him from procuring water for his cattle. Following upon this came an express command of the king to depart, which Isaac obeyed; for he had sought refuge there because of the famine, and had no right to continue at Gerar, if the people refused their hospitality.