And Ahimaaz the son of Zadok said again to Joab, "But whatever happens, please let me also run after the Cushite." So Joab said, "Why will you run, my son, since you have no news ready?"
2 Samuel 18:22
Surrounding context
18:21 Then Joab said to the Cushite, "Go, tell the king what you have seen." So the Cushite bowed himself to Joab and ran.
18:22 And Ahimaaz the son of Zadok said again to Joab, "But whatever happens, please let me also run after the Cushite." So Joab said, "Why will you run, my son, since you have no news ready?"
18:23 "But whatever happens," he said, "let me run." So he said to him, "Run." Then Ahimaaz ran by way of the plain, and outran the Cushite.