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Ibn Ezra on Genesis 31:13/אבן עזרא על בראשית ל״א:י״ג

אאנכי האל בית אל. טעמו האל אל בית אל וכן "ועץ הדעת" (בראשית ב ט) דעת טוב ורע:
1I AM THE GOD OF BETH-EL. Its meaning is: I am the God, God of Beth-el.16 has the definite article prefixed to it, it cannot be in the construct with Beth-el. Hence what we are dealing with is an abridged phrase. See notes to I.E.’s comment on Gen. 2:9. The same is the case with and the tree of the knowledge of good and evil (Gen. 2:9), which is to be interpreted as if written: and the tree of the knowledge, knowledge of good and evil.17