(18-22) Isaac digged again the wells... — This activity of Isaac called forth anew the opposition of the Philistines, His first well was in the wady of Gerar, and was the more valuable because it was not the mere remains of the water of the torrent, but was fed by a spring, as we learn from its being called “a well of living water.” But though Isaac had a right to these wells by reason of the old covenant between his father and the king, yet when his claim was resisted he abandoned the well, but in token of displeasure called it Esek, contention. When compelled to resign his next well he called it by a harsher name — Sitnah, enmity; for their opposition was developing into bitter persecution. And now, wearied with the strife, he withdrew far away, and the Philistines, having gained their end, followed him no farther. In quiet, therefore, he again dug a well, and called it Rehoboth, wide open spaces. It has been identified with one in the wady Ruhaibeh now stopped up, but originally twelve feet in diameter and cased with hewn stone. It lies to the south of Beer-sheba, at a distance of 8⅓ leagues, and about forty miles; away from Gerar.
Genesis 26:18-22
18 And Isaac digged again the wells of water, which they had digged in the days of Abraham his father; for the Philistines had stopped them after the death of Abraham: and he called their names after the names by which his father had called them.
19 And Isaac's servants digged in the valley, and found there a well of springingd water.
20 And the herdmen of Gerar did strive with Isaac's herdmen, saying, The water is ours: and he called the name of the well Esek;e because they strove with him.
21 And they digged another well, and strove for that also: and he called the name of it Sitnah.f
22 And he removed from thence, and digged another well; and for that they strove not: and he called the name of it Rehoboth;g and he said, For now the LORD hath made room for us, and we shall be fruitful in the land.