פירוש על בראשית 22:12

אל תשלח LAY NOT THINE HAND [UPON THE LAD] to slay him. Then he (Abraham) said to God, “If this be so, I have come here for nothing; let me at least inflict a wound on him and draw some blood from him”. God replied, “Neither do thou anything (מאומה) to him” — inflict no blemish (מום) on him (Genesis Rabbah 56:7).

FOR NOW I KNOW THAT THOU ART A G-D FEARING MAN. At the beginning Abraham’s fear of G-d was latent; it had not become actualized through such a great deed. But now it was known in actuality, and his merit was perfect, and his reward would be complete from the Eternal, the G-d of Israel.³⁸⁵See Ruth 2:12.
The doctrine of this chapter which teaches that G-d is the One who tries Abraham and commands him about the binding of Isaac, and it is the angel of G-d who restrains and promises him, will be explained in the verse, The angel who hath redeemed me.³⁸⁶Further, 48:16.

כי עתה ידעתי, I now can demonstrate My knowledge about you to the whole world,