Thus they made a covenant at Beersheba. So Abimelech rose with Phichol, the commander of his army, and they returned to the land of the Philistines. Then Abraham planted a tamarisk tree in Beersheba, and there called on the name of the Lord, the Everlasting God. And Abraham stayed in the land of the Philistines many days. (Gen 21,32-34)

The visit of the Abimelech and Phichol to Abraham was by no means a warm reunion of old friends. Rather, it was forced by the need to find reconciliation and to establish mutual boundaries, both geographical and in terms of how the two sides would deal with each other. It is not for no reason, therefore, that it is mentioned that as soon as the agreement was achieved, the two guests returned "at once" to their land. Neither side felt any need to prolong the meeting.

Abraham breathed a sigh of relief. He was glad to be able to stay in this place, now when it was obvious that the Philistines were not going to get any closer than was necessary. After their commanders left, he realized again with gratitude that his God would accompany him on his travels. After all, if it hadn't been for that, things could have gone very badly with him, the conflict having nearly flared up at least twice. So he did something which was already a characteristic part of his life, but this was especially true after significant events. He had done it so many times, and yet the Scriptures do not fail to mention it about him again: he "called on the name of the Lord, the everlasting God."

Abraham built altars and called upon God throughout the land that God had promised him. In this sense, he omitted Egypt, which did not belong to him, but did not exclude the land of Philistines. For God had told him of all that land, including Gerar, that it would belong to his descendants; he could not yet give it to them, but he was already entrusting it to his God. He already understood well that this gift, which God had given him, was not just there for his descendants to enjoy. The land was, moreover, to fulfill the higher purpose of the eternal God - to be a revelation of His glory to the whole world.