2 Samuel 18:19-23

19Then Ahimaaz the son of Zadok said, “Let me run and give the king the good news that the Lord has vindicated him before his enemies.”

20But Joab said to him, “You will not be a bearer of good news today. You will bear good news some other day, but not today, for the king’s son is dead.”

21Then Joab said to the Cushite, “Go and tell the king what you have seen.” After bowing to Joab, the Cushite ran off.

22Ahimaaz the son of Zadok again spoke to Joab, “Whatever happens, let me go after the Cushite.” But Joab said, “Why is it that you want to go, my son? You have no good news that will bring you a reward.”

23But he said, “Whatever happens, I want to go!” So Joab said to him, “Then go!” So Ahimaaz ran by the way of the Jordan plain, and he passed the Cushite.