2 Samuel 14:2

14:2 So Joab sent to Tekoa and brought from there a wise woman. He told her, “Pretend to be in mourning and put on garments for mourning. Don’t anoint yourself with oil. Instead, act like a woman who has been mourning for the dead for some time.

2 Samuel 20:22

20:22 Then the woman went to all the people with her wise advice and they cut off Sheba’s head and threw it out to Joab. Joab blew the trumpet, and his men dispersed from the city, each going to his own home. Joab returned to the king in Jerusalem.