Midrasch zu Bereschit 30:34

And at that time Ishmael took his wife and his children, and his cattle, and all belonging to him, and went forth into the land of the Philistines to his father Abraham, and Abraham related unto his son all concerning the treatment he received of Ishmael’s first wife. And Ishmael and his children tarried with Abraham for many days in the land of the Philistines. And Abraham dwelt in the land of the Philistines many years, and the time increased to twenty-six years. And after that time Abraham and all his servants departed from the land of the Philistines unto a great distance, and they came into the neighborhood of Hebron and they located there. And Abraham and his servants dug there wells of water, and Abraham and all belonging to him dwelt around the water. And the servants of Abimelech, the king of the Philistines, heard it that the servants of Abraham have dug wells within the limits of the Philistines’ land, and they came and quarreled with the servants of Abraham, and they ejected them and took possession of the great well which Abraham's servants had dug. And when Abimelech, king of the Philistines, heard these things, he and Fichol his commander-in-chief and twenty of his men came unto Abraham, and Abimelech spoke unto Abraham concerning his servants. And Abraham rebuked Abimelech on account of his men having ejected him from the well, and Abimelech replied, saying: As God liveth who created all the earth, I know nothing of the whole affair between our servants until this day. And Abraham took seven sheep and gave them to Abimelech, saying: Take this from me that it be a testimony that I have dug this well. And Abimelech accepted the seven sheep as also flocks and herds in great numbers which Abraham gave unto him, and Abimelech swore unto Abraham in regard to that well. Therefore this place is called Beer-Sheba, because there both of them have sworn. And after they had established a covenant between themselves, Abimelech and Fichol with his men arose and returned unto the land of the Philistines. And Abraham with all belonging to him remained in Beer-Sheba, where they dwelt for many days. And Abraham planted in Beer-Sheba a large grove and made to it four gates towards the four winds of heaven. And within that grove he planted a vineyard, so that the traveler could enter from whatever side he came, and he could eat and drink and resume his journey. For Abraham's house was ever open to all the sons of man that passed and repassed that way; and the travelers always stopped in to eat and to drink in Abraham's house day after day.