The chapter
Simply A man is told to leave his country and his family for a land that is never named, and he goes. The chapter then follows him into Canaan and down into Egypt, where fear makes him lie about his wife.
Context Genesis 12 opens the second half of the book. The eleven chapters before it move through the whole world: creation, the flood, the scattering at Babel. From here to the end, Genesis follows one family.
Verse 1
Simply The instruction gets more specific as it goes: your country, then your relatives, then your father's house. The destination stays unnamed.
Context The previous chapter ends with Abram's family setting out from Ur for Canaan and stopping at Haran, where they settled. The call here picks up a journey the family had already begun and abandoned.
Verses 2-3
Simply The promise answers the loss. He is told to leave a family and a land, and he is promised a nation, a name, and a blessing that reaches beyond him.
Context A great name is exactly what the builders at Babel had tried to make for themselves three chapters earlier, and were scattered for. Here it is given rather than seized.
Verse 4
Simply The verse records that he went, how old he was, and who went with him. It records nothing about what he felt or what he thought of the instruction.
Context Genesis returns to this departure much later, when Abraham is old and the promise of a nation still rests on one son.