John Chrysostom
When all was prepared and nothing further was needed, the Lord, intending to demonstrate that His command was not meant for the actual sacrifice of the son, but to reveal the virtuous nature of the righteous man, ultimately manifested His humanity. He honored the righteous man for his steadfast will, affirming the patriarch's readiness to make the profound sacrifice.
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Scripture states, “But the angel of the Lord called to him from heaven, and said, Abraham, Abraham!” Upon witnessing that the righteous man was prepared to fulfill His will and was on the verge of sacrificing his son, God called from heaven, “Abraham, Abraham!” This repetition was meant to temper the fervor of the righteous man and to halt the hand of the patriarch, which was already raised in readiness for the sacrifice.