2 Samuel 3:26

3:26 Then Joab left David and sent messengers after Abner. They brought him back from the well of Sirah. (But David was not aware of it.)

2 Samuel 14:29

14:29 Then Absalom sent a message to Joab asking him to send him to the king, but Joab was not willing to come to him. So he sent a second message to him, but he still was not willing to come.