The Lord created the world. The Lord judged, destroyed and eventually re-created the world in and through the flood. He judged and dispersed the world at Babel. Up to this point, the Bible records the history of mankind. Now, the stage is set for God to unfold further his covenant of redemption, with the calling of a man who will grow into the people of God—a people that will eventually be sent out into the world as priests to reconcile all peoples back to their maker. The promised seed of woman would one day see birth and then the serpent’s head beneath his foot (See Genesis 3:15).
But these events are future. At thepoint in history when Abraham is called, there is disorder after Babel. So God speaks again. The God who spoke and created the world from nothing speaks again, this time calling out into barrenness or a sort of empty chaos, rather than into the void. His goal is to reform or re-create what He necessarily destroyed at Babel and to bring order and fruitfulness to the earth through a people of His creation.
Abram, the father of this people, is a man from the blessed line of Shem. Though the line of his fathers is blessed, he is a man who has grown up and lives in Ur of the Chaldeans—a place full of the worship of false gods. Then God calls to him:
Go from your country
and your kindred
and your father’s house
to the land that I will show you.
And I will make of you a great nation,
and I will bless you and make your name great,
so that you will be a blessing.
I will bless those who bless you,
and him who dishonors you I will curse,
and in you all the families of the earth shall be blessed. (Gen 12:1-3)
As set up here, this call to Abram has two general parts, command and promise. The command contains three elements but is, essentially, a command to leave everything. With each successive element the command moves closer to the heart of what man holds dearest: homeland ==> family ==> head (father/parents). Not only must Abraham move away from his country but he must establish his own family (or have no family) and assume the role as head of that family. He must become his own man, guided solely by the command of God. And his destination is apparently just a type of “sight-seeing” tour; all he knows is that he is going to see a particular piece of land.
But the gospel has been spoken. Now, it begins to unfold.
 The ESV does not divide the text here into “poetic” lines. Again, I have done so to help make the various aspects of the promise distinct in appearance.