Gen 21:33

“אשל [AND ABRAHAM PLANTED AN] אשל — Rab and Samuel differ as to what this was. One said it was an orchard from which to supply fruit for the guests at their meal. The other said it was an inn for lodging in which were all kinds of fruit (Sotah 10a). And we can speak of planting an inn for we find the expression planting used of tents, as it is said, (Daniel 11:45) “And he shall plant the tents of his palace”. 'ויקרא שם וגו AND HE CALLED THERE etc. — Through this Eshel the name of the Holy One, blessed be He, was called “God of the entire Universe”. For after they had eaten and drunk he said to them, “Bless Him of whose possessions you have eaten! Do you think that you have eaten of what is mine? You have eaten of that which belongs to Him Who spake and the Universe came into existence” (Sotah 10a).”

“AND HE CALLED THERE IN THE NAME OF THE ETERNAL, ‘E-IL OLAM’ (THE EVERLASTING G-D). Scripture explains that Abraham called by the name Eternal He Who in His might directs the time. It may be that heaven and earth are here being called olam (world) [so that the sense of the verse is, “he called by the name Eternal the G-d of the world”], as is a customary expression in the words of our Rabbis. Thus Scripture informs us by this that Abraham called out and informed people of the secret of the leadership of the entire world, namely, that it is in the name of the Eternal, the Mighty One in strength, Supreme in power over all. Now the Rabbi, Note 139. said in the Moreh Nebuchim that this alludes to the principle of the pre-existence of G-d since Abraham let it be known that G-d existed before the creation of time. Onkelos, however, said of the word vayikra (and he called), that it refers to prayer.”