Genesis 1:26

"Then God said, 'Let us make man in our image, in our likeness, and let them rule over the fish of the sea and the birds of the air, over the livestock, over all the earth, and over all the creatures that move along the ground.'"  Genesis 1:26

Here God is making mankind patterned after himself, to rule over every other creature he just created.  The interesting thing here is his use of the plural when talking about himself.  The Hebrew word for "God" is a plural word and here he says "Let us."  I think it's important to note John 1:1-2  "In the beginning was the Word, and the Word was with God, and the Word was God.  He was with God in the beginning."  Whether there were multiple separate divine beings at the creation, there were at least multiple personalities: the Word (or the Son) and the Father.  From these verses they would appear to be separate beings, but we're still only in the first chapter of the first book.  I'll keep looking.