'Watchman' in the Bible

Now the watchman [was] standing on the tower in Jezreel, and he saw the company of Jehu when he came, and he said, "I see a company." Joram said, "Take a horseman and send [him] to meet them." And he said, "Is it peace?"

So the rider of the horse went out to meet him, and he said, "Thus the king asks, 'Is it peace?'" Then Jehu said, "{What do you have to do with peace}? Turn after me." Then the watchman reported, saying, "The messenger went up to them, but he did not return."