2 Samuel 3:26-28 Living Bible (TLB)
26 Then Joab sent messengers to catch up with Abner and tell him to come back. They found him at the well of Sirah and he returned with them; but David knew nothing about it. 27 When Abner arrived at Hebron, Joab took him aside at the city gate as if to speak with him privately; but then he pulled out a dagger and killed him in revenge for the death of his brother Asahel.
28 When David heard about it he declared, “I vow by the Lord that I and my people are innocent of this crime against Abner.