Genesis 21:31

31That is why he named that place
Heb “that is why he called that place.” Some translations render this as an impersonal passive, “that is why that place was called.”
Beer Sheba,
The name Beer Sheba (בְּאֵר שָׁבַע, beer shava’) means “well of the oath” or “well of the seven.” Both the verb “to swear” and the number “seven” have been used throughout the account. Now they are drawn in as part of the explanation of the significance of the name.
because the two of them swore
The verb forms a wordplay with the name Beer Sheba.
an oath there.

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