חסידות אויף בראשית 18:1

וַיֵּרָ֤א אֵלָיו֙ יְהוָ֔ה בְּאֵלֹנֵ֖י מַמְרֵ֑א וְה֛וּא יֹשֵׁ֥ב פֶּֽתַח־הָאֹ֖הֶל כְּחֹ֥ם הַיּֽוֹם׃

און גאָט האָט זיך באַװיזן צו אים, בײַ די אײכנבײמער פֿון מַמרֵא, װען ער איז געזעסן אין אײַנגאַנג פֿון זײַן געצעלט, אין דער היץ פֿון טאָג.

Noam Elimelekh

And Hashem appeared to him etc (Genesis 18:1) - we have to explain first the verse "And Avraham was old, entered in days" (Genesis 24:1). Behold, the upper worlds are called "days" and the tzadik in their kedusha reaches up to the upper worlds, and this is "Avraham was old/zaken" as in "this one acquired wisdom"/Zeh Kanah chochmah" (Sifra, Kedoshim 7:12); "entered in days" meaning, until he reached the upper worlds, and so too about King David, peace be upon him, it was said "And David was old, entered in days etc" (I Kings 1:1) and this is "He asked from You life; You granted him many days" (Ps. 21:5). That behold regarding the tzadik, the life they have in this world is not his, rather, it is as a borrowed thing for one hour, and because of this the tzadik goes and strengthens themself always in holiness, since the tzadik always thinks that lest today it will be the day of returning what was borrowed, and this is "he asked from You life", meaning, meaning, the tzadik who thinks that life is only borrowed from You, therefore "You granted him many days", through this the tzadik merits many days, which are the life in the world to come.
פֿרעגט אַ רבֿBookmarkShareCopy

Beit Aharon

The verse states: And the Lord appeared to him. This expression is not written any [other] place [perhaps he means to say any other place before Abraham was circumcised]. And we can say [to explain this,] that there was no appearance of God in the world until Abraham accepted the covenant [of circumcision]. But from when he accepted the covenant, God appeared in the world. It comes out that that the Holy One, blessed be He, appears in the world on account of Abraham. And this is [the meaning of] And the Lord appeared to him. That is that he brought the sojourning of the Lord into this world. And then Isaac was born and then Jacob was born. [For] the forefathers are the chariot of the supernal Lights that appeared in the world, that being a sign for [their] children. The forefathers are a marker and a sign for the children, that we should learn from them and see how much effort the forefathers expended in this world and what level they reached with their efforts. And that is the teaching to their children, that every Jew should expend effort and toil, each one according to his place and makeup. [Then] they will certainly reach a high level. For the entire Torah teaches us how to be a Jew.
פֿרעגט אַ רבֿBookmarkShareCopy

Kedushat Levi

‎Genesis 18,1. “Hashem appeared to him (Avraham) in the ‎groves of Mamre.” Since we have been told that G’d had ‎departed from Avraham in 17,23, we would have expected the ‎verse here to mention the subject Avraham by name. Why does ‎the Torah only write ‎לו‎, “to him?”
G’d, i.e. aspects of the ‎אין ‏סוף‎, G’ds Essence, dispensed different amounts of ‎שפע‎, “original ‎light,” eventually converted in the lower domains of the universe ‎into matter of varying degrees of physical densities. Every such ‎שפע‎, represents a distillation, ‎צמצום‎, “shrinkage, of this original ‎light. [If I understood the concept correctly, Ed.] This process is ‎reflected already in the different names we have for G’d, the ‎letters in these names reflecting varying degrees of G’d’s having ‎restricted His manifestations to His creatures in order to make it ‎compatible with what His creature can tolerate.
This principle ‎applies not only to creatures in the lower part of the universe, i.e. ‎our planet, but also to the different categories of “angels,” ‎disembodied servants of the Lord in the celestial spheres, ‎according to the spiritual level attained by the creature, angel, or ‎human being, as the case may be.
When such a human being ‎has been given a “name” by its Creator, this “name” reflects the ‎degree to which this person is able to absorb G’d’s “light,” ‎without being harmed by it. When a human being serves his ‎Creator out of awe, ‎יראה‎, by totally negating the limitations ‎imposed on a soul while it is constricted by the body it inhabits, it ‎may be considered as having “disrobed,” shed the restrictions his ‎body imposed upon the free, upward, heavenward motion of his ‎soul. When we express this concept in terms of the meaning of ‎the letters in our G’d-given names, this means that we have ‎divested ourselves of our “names.”
Avraham, at the time of his ‎life that the Torah speaks about here, had not yet freed himself ‎from the limits imposed upon him (by dint of the letters in his ‎name) prior to his having been circumcised. This state of flux, a ‎temporary situation, in which Avraham found himself at the ‎beginning of this portion, is reflected in the Torah referring to him ‎only by a pronoun, instead of by his full name.‎
פֿרעגט אַ רבֿBookmarkShareCopy