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Ramban on Deuteronomy 32:10/רמב"ן על דברים ל״ב:י׳

אוְטַעַם כְּאִישׁוֹן עֵינוֹ, רֶמֶז לְנִצּוּר, יֹאמַר שֶׁיִּנְצֹר הַשֵּׁם אוֹתוֹ כַּאֲשֶׁר יִצֹּר הוּא עַצְמוֹ אֶת עֵינוֹ, אוֹ תֶּחְסַר מִלַּת אִישׁ, יִצְּרֶנְהוּ כְּאִישׁ אִישׁוֹן עֵינוֹ, כִּי מִן הַסְּתָם בְּאִישׁ יְדַבֵּר, וְכֵן רַבִּים:
1The expression [He kept him] as the apple of His eye44 alludes to watchfulness, the verse stating that G-d watched over him as He would shield “His own eye.” Or it may be that the word “man” is missing here: He watched over him as a man shields the apple of his eye, for generally [where there is no specific reference to the contrary, it is assumed that] Scripture speaks of man. There are many similar verses.