Deuteronomy 32:10 (a) The apple of the eye is the eyeball. It is very sensitive, is easily injured, and is very valuable to its owner. The expression is used as a type of the nation of Israel, which was, and is, so precious to GOD.

Psalm 17:8 (a) Here the Psalmist himself takes the place of being the apple of GOD's eye. He felt that he was so easily hurt by his enemies, and yet was so valuable to GOD that he dared to use that type to illustrate his own position before GOD.

Proverbs 7:2 (a) The Law of GOD is here presented as being just as precious as the apple of the eye, and should therefore be guarded and preserved most carefully.

Lamentations 2:18 (a) Probably the expression here represents a call from GOD to esteem their position as children of GOD, and the nation of GOD more highly than they were doing. Surely if Israel remembered that they were as the apple of GOD's eye, they would not cease weeping until they were again obeying and worshiping Him.

Zechariah 2:8 (a) GOD is evidently notifying the world that the nation of Israel is unusually dear and precious to Him, and that He will protect that nation from every enemy. Those who touch Israel in any way to hurt them will in fact put their finger into the eye of GOD.