What it is that God is trying to teach Abraham through the narrative of Genesis 12-22

What it is that God is trying to teach Abraham through the narrative of Genesis 12-22.
The secondary sources can be used from this link http://libguides.stthom.edu/c.php?g=194252&p=1278189
The two sources can be from any library or article, they cannot just be online sources, they have to be scholarly sources.

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