The Philistines did not welcome either Abraham or Isaac in the area, especially once they began to prosper. They had stopped the wells dug in Abraham’s time, and this seems to have happened some time before, and not to be a jealous response to Isaac’s recent blessing from God.
Though unbelievers try to drive Christians completely out of this world, the Lord makes room for them and gives them a corner to dwell in, until the time comes when they shall inherit the earth. This name was given in faith for it was Isaac’s acknowledgment that God had provided for him. He understood that the believer cannot be free from strife and contention in this life, but that God is able to make a place of peace for us in spite of our enemies.
Verse 15 and verse 18 both mention wells that Abraham had dug. Genesis 21:30 refers to the well at Beersheba and verse 25 of the same chapter shows that other wells had been dug by him. Aalders does not believe that Genesis 26:15 and 18 both refer to the same wells as he envisages the stopping of the wells in verse 15 as forcing Isaac to move to a new area. The wells of verse 18 must then be in that new area and not in the area he had left. But if verse 15 is an introductory comment setting the scene for what follows, then it can be understood to refer to all the wells that Abraham had dug and not just in the region where Isaac first settled. This is confirmed by the fact that these wells are said in verse 18 to have been long since stopped for they were filled by the Philistines after the death of Abraham and not on the arrival of Isaac. By filling up his wells, as Calvin says, they discouraged Abraham from ever returning to live among them.