To help us understand who "us" is at Genesis 3:22, we need to see what the situation was like in heaven when God spoke these words. The Bible says that the Father, Jehovah God created His son Jesus as the very first of all creation:
Rev. 3:14 says that Jesus is "the Beginning of the creation of God". NASB
John 1:18 says that Jesus is God's "only BEGOTTEN Son". ASV
Col. 1:15 says that Jesus is "the FIRSTBORN of all creation".
So when God said "Let us make man in our image" at Gen. 1:26, and “The man has become like one of us in knowing good and bad” at Gen. 3:22), God was speaking to His only-begotten Son Jesus, His Master Worker, the first-born of all creation, *through* whom all other things came into existence. (Prov. 8:30, 31; also compare John 1:1-3; Col 1:15-17.)
Here is a very good article about this:
To whom was God referring as “one of us” at Genesis 3:22?
http://wol.jw.org/en/wol/d/r1/lp-e/2003766#s=0:0-6:571
Also see:
Is Gen. 1:26 Really "Proof" of the Trinity? ("Let US make man in OUR image.")
http://defendingjehovahswitnesses.blogspot.com/2014/06/is-gen-126-really-proof-of-trinity-let.html
Rev. 3:14 says that Jesus is "the Beginning of the creation of God". NASB
John 1:18 says that Jesus is God's "only BEGOTTEN Son". ASV
Col. 1:15 says that Jesus is "the FIRSTBORN of all creation".
So when God said "Let us make man in our image" at Gen. 1:26, and “The man has become like one of us in knowing good and bad” at Gen. 3:22), God was speaking to His only-begotten Son Jesus, His Master Worker, the first-born of all creation, *through* whom all other things came into existence. (Prov. 8:30, 31; also compare John 1:1-3; Col 1:15-17.)
Here is a very good article about this:
To whom was God referring as “one of us” at Genesis 3:22?
http://wol.jw.org/en/wol/d/r1/lp-e/2003766#s=0:0-6:571
Also see:
Is Gen. 1:26 Really "Proof" of the Trinity? ("Let US make man in OUR image.")
http://defendingjehovahswitnesses.blogspot.com/2014/06/is-gen-126-really-proof-of-trinity-let.html