Targum zu Bereschit 3:22

And the Lord God said to the angels who ministered before Him, Behold, Adam is sole on the earth, as I am sole in the heavens above; and it will be that they will arise from him who will know to discern between good and evil. Had he kept the commandments which I appointed to him, he would have lived and subsisted as the tree of life for ever. But now, because he hath not kept that which I prescribed, it is decreed against him that we keep him from the garden of Eden, before he reach forth his hand and take of the tree of life: for, behold, if he eat thereof, living he will live and subsist for ever.

And the Word of the Lord God said, Behold, Adam whom I have created is sole in my world, as I am sole in the heavens above. It is to be that a great people are to arise from him; from him will arise a people who will know how to discern between good and evil. And now it is good that we keep him from the garden of Eden before he stretch forth his hand and take also of the fruit of the tree of life, and eat, and live for ever.