Genesis 12:1–9 is a landmark passage in the Bible. God calls Abram to leave his people and land behind. He also promises to bless Abram and to make his descendants into a great nation who will one day occupy the land of Canaan. Though childless, and with no obvious path to becoming a father of an entire culture, Abram begins to worship the Lord in the land of Canaan, journeying through the land and building altars to God.
For a more detailed summary select the link below.
“Genesis 12:2” Bibleref.com
2 I will make of you a great nation. I will bless you and make your name great. You will be a blessing.