Therefore he called that place Beersheba; because there they swore both of them.
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George Leo Haydock
Bersabee. That is, the well of oath; (Challoner) or "the well of the seven "meaning the seven ewe-lambs set apart. (Menochius)
This precaution of Abraham, in giving seven lambs as a testimony that the well was dug by him, was not without reason. See chap. xxvi. 15. (Calmet)