Psalms 17:8

(8) Apple of the eye.—Literally, little man, daughter of the eye. The mannikin is, of course, the reflection seen in the pupil. Daughter is either a contraction of a word meaning cavity, or is the common Hebrew idiom which by son or daughter of expresses relation, as sons of the bow = arrows. In fact, the curious Hebrew phrase is substantially like the Greek κόρη and Latin pupa, or pupilla, even to the gender.

Hide me under the shadow of thy wings.—The figure of the sheltering wings of the parent bird, so common in Hebrew literature, generally refers to the eagle or vulture, as in Deuteronomy 32:10-11, the source of both the beautiful images of the text. Our Lord’s use of the figure is made more tender by the English rendering, “hen” (Matthew 23:37). (See Note New Testament Commentary.)