2 Samuel 18:19-23

19Then Ahimaaz the son of Zadok, said, “Let me run and bring the king news that the Lord has vindicated him by rescuing him from [the power of] his enemies.”

20But Joab told him, “You are not the man to carry news [to King David] today, but you shall carry news another day. On this day you shall carry no news, because the king’s son is dead.”

21Then Joab said to the Cushite (Ethiopian), “Go, tell the king what you have seen.” And the Cushite bowed to Joab and ran.

22Then Ahimaaz the son of Zadok said again to Joab, “But whatever happens, please let me also run after the Cushite.” Joab said, “Why should you run, my son, seeing you will have no messenger’s reward for going [because you have only bad news]?”

23“But whatever happens, Let me run.” So Joab said to him, “Run.” Then Ahimaaz ran by the way of the plain [of the Jordan River] and outran the Cushite.