Kommentar zu Bereschit 3:4

לא מות תמתון YE SHALL NOT SURELY DIE — He pushed her until she touched it. He then said to her, “Just as there is no death in touching it, so there is no death in eating it” (Genesis Rabbah 19:3).

לא מות תמותון “you will sure not die, כי יודע אלוקים כי בים אכלכם ממנו ונפקחו עיניכם, G’d did not forbid this fruit because it is lethal, but because He knows that through eating it you will attain additional knowledge so that you will be just like G’d, possessing total knowledge.

ויאמר הנחש…לא מות תמותון. The serpent said: "You will most certainly not die." The reason the serpent repeated the reference to death was to counter Eve's fears that the tree itself was lethal, or that even if it were not harmful at all, G'd would punish them with death for disobeyimg Him. The serpent claimed that neither natural nor judicial death would result from contact with the tree or its fruit. Assuming that the serpent was right, this in turn raises the question of why G'd had forbidden the fruit of that tree? The serpent had to make such a prohibition sound plausible. This is why it continued that G'd was aware that as soon as man ate from that tree he would become a real competitor to G'd, i.e. knowing what is good and what is harmful. This argument was pure blasphemy. The only reason that the wicked serpent was able to employ such an argument was that its creation had preceded that of man. The serpent was able to use its senior status in the history of creation to claim that it was privy to matters that Adam and Eve could not have been privy to. He also argued that the reason he (the serpent) had been denied entry to גן עדן was that entry had been permitted only to those who were not privy to the secret of the tree of knowledge and what it represented. It claimed that by preventing the serpent from entering the garden G'd had wanted to preserve the secret of the power that tree would impart to those who ate from it. According to the serpent, once Eve would eat from that tree she would no longer be afraid of G'd, and G'd would no longer exercise any control over her. The use of such an argument was idolatrous. According to our halachah idolatry is punishable even when it is merely an intellectual conviction (Berachot 12).