'Watchman' in the Bible

Now the watchman was standing on the tower in Jezreel and saw Jehu's troops approaching. He said, "I see troops!" Jehoram ordered, "Send a rider out to meet them and have him ask, 'Is everything all right?'"

So the horseman went to meet him and said, "This is what the king says, 'Is everything all right?'" Jehu replied, "None of your business! Follow me." The watchman reported, "The messenger reached them, but hasn't started back."

The watchman reported, "He reached them, but hasn't started back. The one who drives the lead chariot drives like Jehu son of Nimshi; he drives recklessly."