This story shows that God would allow Abram to put his promises at risk in this episode. Soon after Abram obeyed God’s call, a famine tested his weak faith. God rescued Abram and his family, even though Abram acted foolishly. In Egypt, he used deception instead of trusting God to protect him.
This story intentionally mirrors Israel's later slavery in Egypt:
Because of a famine (compare Genesis 12:10 with Genesis 47:13), Abram and Israel went to Egypt (compare Genesis 12:10 with Genesis 47:27).
There was an attempt to kill the males and save the females (compare Genesis 12:12 with Exodus 1:22).
God sent plagues to Egypt (compare Genesis 12:17 with Exodus 7:14–11:10).
Abram and Israel took riches from Egypt (compare Genesis 12:16 with Exodus 12:35–36).
Pharaoh expelled them (Hebrew shalakh, meaning “send”; compare Genesis 12:19–20 with Exodus 12:31–33) and they went to the Negev (compare Genesis 13:1 with Numbers 13:17, 22).
Israel was to believe that God would deliver them from bondage in Egypt through the plagues because their ancestor had already been rescued from bondage in Egypt.