Bereshis 26:31-33

Orthodox Jewish Bible

³¹ And they rose up early in the boker, and swore one to another: and Yitzchak sent them away, and they departed from him in shalom.

³² And it came to pass the same day, that the avdei Yitzchak came, and told him concerning the be’er which they had dug, and said unto him, We have found mayim.

³³ And he called it Shevah (Seven, Oath): therefore the shem of the Ir is Beer-Sheva unto this day.