Kabbalah zu Bereschit 18:1
וַיֵּרָ֤א אֵלָיו֙ יְהוָ֔ה בְּאֵלֹנֵ֖י מַמְרֵ֑א וְה֛וּא יֹשֵׁ֥ב פֶּֽתַח־הָאֹ֖הֶל כְּחֹ֥ם הַיּֽוֹם׃
Und der Ewige erschien ihm in dem Eichenhain des Mamre, während er um die heiße Tageszeit am Eingang des Zeltes saß.
Zohar
And she [Tamar] sat on Petach Eynayim [the entrance to the eyes] (Gen. 38:14) - Just as you say "and he [Avraham] sits at the entrance [petach] of the tent" (Gen. 18:1), and it is written "And Ad-nai passed over the entrance [petach]" (Ex. 12:23), and it is written "open [pitchu] for me the gates of righteousness etc" (Ps. 118:19) [meaning] that all eyes of the world turn to that opening. [...]
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