Joab convinces David to bring Absalom back
Joab used an elaborate plot to convince David to bring Absalom back from Geshur. David knew Joab was behind it, but it worked.
Key passages
2 Sa 14:1–22

Joab the son of Zeruiah realized that the mind of the king was on Absalom. So Joab sent to Tekoa and took from there a wise woman, and he said to her, “Please pretend to mourn and put on garments of mourning. You should not anoint yourself with oil, and …

See also
Important Things