2 Samuel 18:20-24

But Joab said to him, “You are not the man to bring news this day, but you shall bring news another day; however, you shall bring no news this day, because the king’s son is dead.”

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.