In the days of Abraham - Instead of בימי bimey, in the days, Houbigant contends we should read עבדי abdey, servants. Isaac dug again the wells which the servants of Abraham his father had dug. This reading is supported by the Samaritan, Septuagint, Syriac, and Vulgate; and it is probably the true one.

And Isaac digged again the wells of water, which they had digged in the days of Abraham his father,.... This seems to refer to the same wells made mention of in Genesis 26:15, since it follows:

for the Philistines had stopped them after the death of Abraham; these were what Abraham's servants had dug, when he lived at Gerar, and which the Philistines durst not stop during his life; but when he was dead and particularly out of envy to Isaac his son, whom they observed to prosper much, they stopped them up, that he might have no benefit by them; for otherwise they would scarcely have stopped them, if he had not been upon the spot, but would have made use of them themselves. The opening of them again by Isaac seems to be done, as Jarchi observes, before he removed from Gerar to the valley, though it is here related; unless it can be thought that Abraham dwelt in the valley also, and had dug wells there, which the Philistines stopped up after his death, and Isaac opened when he came there; and if so one would think he should have had no occasion to have dug other new wells, as we find he afterwards did; besides, this seems to be out of the jurisdiction of the Philistines, and not in their power to have stopped them here; it seems therefore most probable that these were Abraham's wells at Gerar, and not in the valley. Origen (k) makes mention of wonderful wells being dug in the land of the Philistines by righteous men, meaning Abraham and Isaac; and particularly in Askelon which, according to some, is the same with Gerar; See Gill on Genesis 20:1,

and he called their names after the names by which his father had called them; which he did out of respect to his father, to preserve the memory of his name, as well as to make his title and claim to them the more dear and certain.

(k) Contr. Cels. l. 4. p. 193.

Reopening and Discovery of Wells. - In this valley Isaac dug open the old wells which had existed from Abraham's time, and gave them the old names. His people also dug three new wells. But Abimelech's people raised a contest about two of these; and for this reason Isaac called them Esek and Sitnah, strife and opposition. The third there was no dispute about; and it received in consequence the name Rehoboth, "breadths," for Isaac said, "Yea now (כּי־עתּה, as in Genesis 29:32, etc.) Jehovah has provided for us a broad space, that we may be fruitful (multiply) in the land." This well was probably not in the land of Gerar, as Isaac had removed thence, but in the Wady Ruhaibeh, the name of which is suggestive of Rehoboth, which stands at the point where the two roads from Gaza and Hebron meet, about 3 hours to the south of Elusa, 8 1/3 to the south of Beersheba, and where there are extensive ruins of the city of the same name upon the heights, also the remains of wells (Robinson, Pal. i. 289ff.; Strauss, Sinai and Golgotha); where too the name Sitnah seems to have been retained in the Wady Shutein, with ruins on the northern hills between Ruhaibeh and Khulasa (Elusa).

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.

18-22. Isaac digged again the wells of water-The naming of wells by Abraham, and the hereditary right of his family to the property, the change of the names by the Philistines to obliterate the traces of their origin, the restoration of the names by Isaac, and the contests between the respective shepherds to the exclusive possession of the water, are circumstances that occur among the natives in those regions as frequently in the present day as in the time of Isaac.

26:18-25 Isaac met with much opposition in digging wells. Two were called Contention and Hatred. See the nature of worldly things; they make quarrels, and are occasions of strife; and what is often the lot of the most quiet and peaceable; those who avoid striving, yet cannot avoid being striven with. And what a mercy it is to have plenty of water; to have it without striving for it! The more common this mercy is, the more reason to be thankful for it. At length Isaac digged a well, for which they strove not. Those that study to be quiet, seldom fail of being so. When men are false and unkind, still God is faithful and gracious; and his time to show himself so is, when we are most disappointed by men. The same night that Isaac came weary and uneasy to Beer-sheba, God brought comforts to his soul. Those may remove with comfort who are sure of God's presence.