‘And he said to him, “I am Yahweh who brought you out of Ur of the Chaldees to give you this land to inherit it.” '
This solemn declaration commences the giving of what follows. We can compare it with Exodus 20:2, “I am Yahweh your God who brought you out of the land of Egypt, out of the house of bondage”. It is a declaration of Yahweh's total sovereignty and goodness in readiness for a solemn declaration. Here is specific confirmation that it was in Ur of the Chaldees that God began the calling of Abram.
“To give you this land to inherit it.” Abram has spurned riches at the hands of the king of Sodom, now Yahweh promises not only riches but total possession of the land. In the final analysis land meant everything. While a semi-nomad Abram had many blessings but he was to some extent dependent on others like Melchizedek for the use of land, now Yahweh promises that the land will one day be his, all of it. For purposes which only Yahweh knows the end of.