2 Samuel 18:21-22

21Then Joab spoke to a servant who came from Ethiopia, ‘Go now to the king. Tell him what you have seen.’ The man bent down in front of Joab and then he ran off with the message.

22Zadok's son Ahimaaz spoke to Joab again. He said, ‘I am not afraid of what may happen to me. Please let me run after the Ethiopian man.’ But Joab replied, ‘Why do you want to go as well? The king will not give you any gift for this news.’