וָאֵרָ֗א אֶל־אַבְרָהָ֛ם אֶל־יִצְחָ֥ק וְאֶֽל־יַעֲקֹ֖ב בְּאֵ֣ל שַׁדָּ֑י וּשְׁמִ֣י יְהוָ֔ה לֹ֥א נוֹדַ֖עְתִּי לָהֶֽם׃
Ich bin auch Abraham, Isaak und Jakob erschienen mit [dem Namen]: Gott, Allmächtiger; aber mit meinem Namen Adonai, bin ich ihnen nicht kund geworden.
Rashbam on Exodus
בא-ל שדי, a promise concerning the future that I have not yet fulfilled.
Sforno on Exodus
וארא, in a vision, a communication by G’d just below that of the level we know as נבואה, prophecy. Genesis 18,1 was one such example of G’d “appearing” to Avraham after his circumcision.