16 But a shrewd woman called out from the city, "Listen, everybody! Please tell Joab to come close so I can talk to him." 17 When he had come, the woman said, "Are you Joab?" He said, "I am." "Then," she said, "listen to what I have to say." He said, "I'm listening." 18 "There's an old saying in these parts: 'If it's answers you want, come to Abel and get it straight.' 19 We're a peaceful people here, and reliable. And here you are, trying to tear down one of Israel's mother cities. Why would you want to mess with God's legacy like that?" 20 Joab protested, "Believe me, you've got me all wrong. I'm not here to hurt anyone or destroy anything - not on your life! 21 But a man from the hill country of Ephraim, Sheba son of Bicri by name, revolted against King David; hand him over, him only, and we'll get out of here." The woman told Joab, "Sounds good. His head will be tossed to you from the wall." 22 The woman presented her strategy to the whole city and they did it: They cut off the head of Sheba son of Bicri and tossed it down to Joab. He then blew a blast on the ram's horn trumpet and the soldiers all went home. Joab returned to the king in Jerusalem.
Matthew Henry's Commentary on 2 Samuel 20:16-22
Commentary on 2 Samuel 20:14-22
(Read 2 Samuel 20:14-22)
Justly is that place attacked, which dares to harbour a traitor; nor will the heart fare better which indulges rebellious lusts, that will not have Christ to reign over them. A discreet woman, by her prudent management, satisfied Joab, and yet saved the city. Wisdom is not confined to rank or sex; it consists not in deep knowledge; but in understanding how to act as matters arise, that troubles may be turned away and benefits secured. A great deal of mischief would be prevented, if contending parties would understand one another. Let both sides be undeceived. The single condition of peace is, the surrender of the traitor. It is so in God's dealing with the soul, when besieged by conviction and distress; sin is the traitor; the beloved lust is the rebel: part with that, cast away the transgression, and all shall be well. There is no peace on any other terms.