וַיְרַגֵּ֣ל בְּעַבְדְּךָ֔ אֶל־אֲדֹנִ֖י הַמֶּ֑לֶךְ וַאדֹנִ֤י הַמֶּ֙לֶךְ֙ כְּמַלְאַ֣ךְ הָאֱלֹהִ֔ים וַעֲשֵׂ֥ה הַטּ֖וֹב בְּעֵינֶֽיךָ׃
И клеветал раба твоего на господина моего царя; но господин мой царь как ангел Божий; итак делай добро в глазах твоих.
Sifrei Devarim
R. Akiva says: "doing" (i.e., an action) is mentioned in respect to head, and "doing" is mentioned in respect to nails. Just as the "doing" in respect to head (i.e., shaving) makes her unsightly, so, the "doing" in respect to nails (must be something that) makes her unsightly (viz., letting them grow long.) A proof for this: (II Samuel 19:25) "And Mefibosheth the son of Saul came down towards the king. He had not done his feet and he had not done (i.e., trimmed) his mustache."