The Expulsion from Eden

Genesis 3:22-24
22 And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:
23 Therefore the LORD God sent him forth from the garden of Eden, to till the ground from whence he was taken.
24 So he drove out the man; and he placed at the east of the garden of Eden Cherubims, and a flaming sword which turned every way, to keep the way of the tree of life.

Commentary

The fruit of this tree apparently had such healing propertied that it could actually help the body and repair genetic damage of a life time that eventually leads to death.

Ambrosia, the food of the gods in Greek mythology seems to be a result of combining the fruit of the Tree of Life and that of the Tree of Knowledge of Good and Evil. Since Ambrosia is alleged to convey eternal life and god hood to the eater. The Tree of Life is the eternal life part and the Satan possessed serpent told Eve the fruit of the Tree of Knowledge of Good and Evil would make her as a god.  

The Garden of Eden

Genesis 2:8-9

8 And the LORD God planted a garden eastward in Eden; and there he put the man whom he had formed.
9 And out of the ground made the LORD God to grow every tree that is pleasant to the sight, and good for food; the tree of life also in the midst of the garden, and the tree of knowledge of good and evil.

Commentary

What seems to have happened here is that God rapidly grew a garden while Adam watched. The reason why it had to be rapid is the fact that Genesis 1:26 indicates that both Adam and Eve were created on day six and since Eve had not been created yet, these events too place on day six of the creation week. This is not to be confused with God creating plants on day three, but rather God created some extra pants so Adam could see it happen.

Two specific trees are mentioned here the tree of life also in the midst of the garden, and the tree of knowledge of good and evil both of which are involved in later events. Note it is called “the tree of knowledge of good and evil” and not “the tree of knowledge” as some have claimed it to be.