Albert Barnes Commentary 2 Samuel 14:2

"And Joab sent to Tekoa, and fetched thence a wise woman, and said unto her, I pray thee, feign thyself to be a mourner, and put on mourning apparel, I pray thee, and anoint not thyself with oil, but be as a woman that hath a long time mourned for the dead:" — 2 Samuel 14:2 (ASV)

Tekoah - In the south of Judah, six miles from Bethlehem, the modern Tekua. The rough, wild district was well suited for the lawless profession of the wise woman; it abounds in caves, as does the country near Endor.