2 Samuel 18:21-25

Then Joab said to the Cushite, “Go, tell the king what you have seen.” So the Cushite bowed to Joab and ran.

However, Ahimaaz the son of Zadok said once more to Joab, “But whatever happens, please let me also run after the Cushite.” And Joab said, “Why would you run, my son, since you will have no messenger’s reward for going?”

“But whatever happens,” he said, “I will run.” So he said to him, “Run.” Then Ahimaaz ran by way of the plain and passed by the Cushite.

Now David was sitting between the two gates; and the watchman went to the roof of the gate by the wall, and raised his eyes and looked; and behold, a man was running by himself.

So the watchman called out and told the king. And the king said, “If he is by himself there is good news in his mouth.” And he came nearer and nearer.