Genesis 26:33

Shebah. i.e., an oath. therefore.

21:31

Beer-sheba. i.e., the well of the oath.

28This may have been the same city which was called Beer-sheba a hundred years before this, in the time of Abraham; but as the well, from which it had its name originally, was closed up by the Philistines, the name of the place might have been abolished with the well; when, therefore, Isaac re-opened it, he restored the ancient name of the place.
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