The man has now become like ONE of us, knowing good and evil

[tonychanyt]

What is the "one" referring to?

Let's see the context, Genesis 3:

1 Now the serpent was more crafty than any other beast of the field that the LORD God had made. ...
4But the serpent said to the woman, “You will not surely die. 5For God knows that when you eat of it your eyes will be opened, and you will be like God, knowing good and evil.”

At this point, we know that God and the serpent have the knowledge of good and evil.

After the fall:

22 Then the LORD God said, “Behold, the man has become like one of us in knowing good and evil. Now, lest he reach out his hand and take also of the tree of life and eat, and live forever—”

I think the "one" in "one of us" refers particularly to the crafty serpent.

Cambridge Bible for Schools and Colleges:

“As one of us” will then mean, not “like unto Jehovah personally,” but “like to the dwellers in Heaven,” who are in the possession of “the knowledge of the distinction between good and evil.”

 

[Jesse Dornfeld]

But God said it, not the serpent.

 

[CoreyD]

ONE of us​

Let us - Genesis 1:26
God wasn't speaking to the serpent, but rather, the one God was working with. Who could that be? Proverbs 8:22-31; Revelation 3:14; Colossians 1:15-17