וַיִּשְׁלַ֤ח יוֹאָב֙ תְּק֔וֹעָה וַיִּקַּ֥ח מִשָּׁ֖ם אִשָּׁ֣ה חֲכָמָ֑ה וַיֹּ֣אמֶר אֵ֠לֶיהָ הִֽתְאַבְּלִי־נָ֞א וְלִבְשִׁי־נָ֣א בִגְדֵי־אֵ֗בֶל וְאַל־תָּס֙וּכִי֙ שֶׁ֔מֶן וְהָיִ֕ית כְּאִשָּׁ֗ה זֶ֚ה יָמִ֣ים רַבִּ֔ים מִתְאַבֶּ֖לֶת עַל־מֵֽת׃
約押就派人往提哥亞去，從那裡叫來一個聰明的婦人，對她說：«請你裝作居喪的人，穿上喪服，不要抹油，要像一個為死者哀悼了許多日子的婦人。
Ibn Ezra
To appoint unto them that mourn for Zion that which the text is going to enumerate2aThe words לתת להם to give unto them, are accordingly a mere repetition of the phrase לשום לאבלי ציון to appoint unto them that mourn for Zion.. Beauty for ashes, the oil of joy for mourning. The mourner does not anoint with oil, as may be gathered from the story of the woman of Tekoa. (2 Sam. 14:2).
English Explanation of Mishnah Menachot
Tekoa is “alpha” first its oil. Tekoa, which is in the Negev and is mentioned in II Samuel 14:2 has the best oil.
Rashbam
עקר, with two vowels kametz. Other examples of such constructions are חכם as opposed to אשה חכמה, (Samuel II 14,2) or שפל as opposed to ושפלה איננה in Leviticus 13,21. I have found that all the texts published in Spain follow this vowel pattern. [remember that our author was Ashkenazi. Ed.]