'Watchman' in the Bible

And David sat between the two gates; and the watchman went up to the roof of the gate, on to the wall, and lifted up his eyes and looked, and behold, a man running alone.

And the watchman cried, and told the king. And the king said, If he be alone, there is news in his mouth. And he came on and drew near.

And the watchman saw another man running; and the watchman called to the porter and said, Behold a man running alone. And the king said, He also is a bearer of news.

And the watchman said, I see the running of the foremost like the running of Ahimaaz the son of Zadok. And the king said, He is a good man; and comes with good news.

And the watchman stood on the tower in Jizreel, and saw Jehu's company as he came, and said, I see a company. And Joram said, Take a horseman, and send to meet them, and let him say, Is it peace?

So there went one on horseback to meet him; and he said, Thus saith the king: Is it peace? And Jehu said, What hast thou to do with peace? turn thee behind me. And the watchman told saying, The messenger came to them, and he does not return.

And the watchman told saying, He came to them, and does not return. And the driving is like the driving of Jehu the son of Nimshi; for he drives furiously.

For thus hath the Lord said unto me: Go, set a watchman, let him declare what he seeth.

The burden of Dumah. He calleth to me out of Seir, Watchman, what of the night? Watchman, what of the night?

The watchman said, The morning cometh, and also the night: if ye will inquire, inquire; return, come.

Son of man, I have appointed thee a watchman unto the house of Israel, and thou shalt hear the word from my mouth, and give them warning from me.

Son of man, speak to the children of thy people, and say unto them, When I bring the sword upon a land, and the people of the land take one man from among them all, and set him for their watchman:

But if the watchman see the sword coming, and blow not the trumpet, and the people be not warned, if the sword come and take a person from among them, he is taken away in his iniquity; but his blood will I require at the watchman's hand.

So thou, son of man, I have set thee a watchman unto the house of Israel; and thou shalt hear the word from my mouth, and warn them from me.

Is Ephraim a watchman with my God? nay the prophet is a fowler's snare on all his ways, enmity in the house of his God.