Now it came about after these things, that God tested Abraham, and said to him, “Abraham!” And he said, “Here I am.”
Genesis 22:1 (NASB)
When God first called out to Abraham in Genesis 22, the text seems to show that Abraham responds immediately. He doesn’t know what God is about to say, but from Genesis 12 to now, God’s call has led to something positive. Blessing after blessing.
But the next time God calls Abraham, God says Abraham’s name twice.
But the angel of the Lord called to him from heaven and said, “Abraham, Abraham!” And he said, “Here I am.”
Genesis 22:11 (NASB)
The text doesn’t explain it, but maybe God’s command to sacrifice Isaac is heavy to Abraham.
I can see Abraham not wanting to listen to God again after this. Would you? So maybe God has to say it twice.