In Genesis 3 we read about Adam and Eve partaking of the fruit of the tree of knowledge of good and evil and their subsequent expulsion from the Garden of Eden.  In it, God confronts them regarding their transaction, and there is discussion amongst gods, plural, regarding how Adam has become like them, as well as comments from Satan indicating that eating from the fruit of the tree of knowledge of good and evil would make Adam and Eve like unto the gods, plural, in that they would be like unto them in knowing good from evil.