Genesis 2:14-17

And the name of the third river is the Tigris, which flows east of Assyria. And the fourth river is the Euphrates. The LORD God took the man and put him in the garden of Eden to work it and keep it. And the LORD God commanded the man, saying, “You may surely eat of every tree of the garden, but of the tree of the knowledge of good and evil you shall not eat, for in the day that you eat of it you shall surely die.”