2 Samuel 18:21-25

21Then Joab said to a Cushite, “Go, tell the king what you have seen.” The Cushite bowed down before Joab and ran off.

22Ahimaaz son of Zadok again said to Joab, “Come what may, please let me run behind the Cushite.” But Joab replied, “My son, why do you want to go? You don’t have any news that will bring you a reward.”

23He said, “Come what may, I want to run.” So Joab said, “Run!” Then Ahimaaz ran by way of the plain and outran the Cushite.

24While David was sitting between the inner and outer gates, the watchman went up to the roof of the gateway by the wall. As he looked out, he saw a man running alone.

25The watchman called out to the king and reported it. The king said, “If he is alone, he must have good news.” And the runner came closer and closer.