ליטעראַטור פֿון בית שני אויף בראשית 23:9

[26] To this class belongs also the “double cave” (Gen. 23:9), that pair of precious memories  concerned, one with all that has come into being, the other with Him who has made it. These constitute the nurture of the man of worth, for whom all things in the universe are objects of contemplation, and who loves to inquire also concerning the Father who brought them into being.

[62] But the soul wedded to goodness obtained inhabitants excelling in the virtues, whom the double cave (Gen. 23:9) received in pairs, Abraham and Sarah, Isaac and Rebecca, Leah and Jacob, these being virtues and their possessors. This Hebron, a treasure-house guarding personal monuments of knowledge and wisdom, is earlier than Zoan and all Egypt. For nature wrought soul elder than body (or Egypt), and virtue elder than vice (or Zoan). for “Zoan” means “Command of evacuation”; and nature determines precedence not by length of time but by worth.