Then Joab came to the king and said, "What have you done? Look, Abner came to you; why is it that you sent him away, and he has already gone?
2 Samuel 3:24
Surrounding context
3:23 When Joab and all the troops that were with him had come, they told Joab, saying, "Abner the son of Ner came to the king, and he sent him away, and he has gone in peace."
3:24 Then Joab came to the king and said, "What have you done? Look, Abner came to you; why is it that you sent him away, and he has already gone?
3:25 Surely you realize that Abner the son of Ner came to deceive you, to know your going out and your coming in, and to know all that you are doing."