2 Samuel 3:20-25

When Abner and twenty of his men came to Hebron, David entertained them with a great feast. Then Abner said to David, “Let me go and call an assembly of all Israel to support my lord the king. They will make a covenant with you to make you their king, and you will rule over everything your heart desires.” So David sent Abner safely on his way. But just after David had sent Abner away in safety, Joab and some of David’s troops returned from a raid, bringing much plunder with them. When Joab arrived, he was told that Abner had just been there visiting the king and had been sent away in safety. Joab rushed to the king and demanded, “What have you done? What do you mean by letting Abner get away? You know perfectly well that he came to spy on you and find out everything you’re doing!”