Rashi on Genesis 3:22/רש"י על בראשית ג׳:כ״ב

1היה כאחד ממנו IS BECOME LIKE ONE OF US (or, like the Being who is One, Unique amongst us) — Lo, he is unique among the terrestrial ones, even as I am unique among the celestial ones. And in what does his uniqueness consist? In knowing good and evil, which is not so in the case of cattle and beasts (Genesis Rabbah 21:5).

2ועתה פן ישלח ידו AND NOW, LEST HE PUT FORTH HIS HAND… [AND EAT AND LIVE FOR EVER] — And if he does live forever he is likely to lead people astray, so that they may say, “He, also, is a god”; there are also Agadic Midrashim, but they are not in keeping with its (the verse’s) plain sense.