(33) Therefore the name of the city is Beer-sheba unto this day.--There was no city at this time at Beer-sheba, but one is mentioned at the conquest of Canaan by Joshua (Joshua 15:28). This note, as is the case generally with those which speak of a thing existing "unto this day," was added by Ezra and the men of the Great Synagogue, after the return from Babylon (comp. Genesis 22:14); and its meaning is that, whereas Abraham's name had been forgotten while the place lay desolate, this remarkable coincidence of the water being again found, just when the covenant had been confirmed by the customary sevenfold sacrifice, so impressed the minds of the people that the title of Beer-sheba never again passed into oblivion.

Pulpit Commentary

Verse 33. - And he called it Shebah ("Oath;" which he would certainly not have done had it not been a well): therefore the name of the city (which ultimately gathered round the well) is Beersheba - i.e. the well of the oath (vide Genesis 21:31). Isaac must have perfectly understood that the place had been so named by his father three quarters of a century previous; but either the name had been forgotten by others, or had not come into general use amongst the inhabitants, or, observing the coincidence between his finding a well just at the time of covenanting with Abimelech and the fact that his father's treaty was also connected with a well, he wished to confirm and perpetuate the early name which had been assigned to the town. It is not certain that this was Abraham s well which had been rediscovered; the probability is that it was another, since at Bir-es-Sheba two wells are still in existence (vide Genesis 21:31) unto this day - an expression used throughout Genesis to describe events separated from the age of Moses by several centuries (vide Genesis 19:37, 38; Genesis 22:14; Genesis 32:32).

Matthew Henry's Concise Commentary

26:26-33 When a man's ways please the Lord, he maketh even his enemies to be at peace with him, Pr 16:7. Kings' hearts are in his hands, and when he pleases, he can turn them to favour his people. It is not wrong to stand upon our guard in dealing with those who have acted unfairly. But Isaac did not insist on the unkindnesses they had done him; he freely entered into friendship with them. Religion teaches us to be neighbourly, and, as much as in us lies, to live peaceable with all men. Providence smiled upon what Isaac did; God blessed his labours.

Gill's Exposition of the Entire Bible

And he called it Sheba,.... Which, according to Jerom, signifies "fulness", as if it had its name from the abundance of water in it; but rather it signifies an "oath", and was so called from the oath, which he and Abimelech had just took to one another; and these circumstances meeting together, the taking of the oath, and the account of the well:

therefore the name of the city is Beersheba unto this day; that is, the well of the oath: it had been so called by Abraham an hundred years ago or more; but now upon this occasion it was renewed and confirmed, and so continued until the times of Moses, and many ages after.

BibleApps.com