She shall shave her head, and pare her nails. The shaving of the head and the paring of the nails, as well as the putting off of the garments worn when taken captive, were signs of purification, of separation from former heathenism, preparatory to reception among the covenant people of Jehovah (cf.
Le Deuteronomy 14:8; Numbers 8:7). Pare her nails; literally, make or prepare her nails, i.e. by cutting them down to a proper size and form (cf. 2 Samuel 19:25, where the same word is used of dressing the feet and trimming the beard).
The Targum of Onkelos takes this in quite an opposite sense, rendering, as in the margin of the Authorized Version, "suffer to grow," and the rabbins who adopt this meaning suppose that the design of the prescription was that the woman, being rendered unlovely, the man might be deterred from taking her to be his wife.
But this is altogether alien from the spirit and scope of the passage.