'Watchman' in the Bible

Now David was sitting between the two gates: and the watchman went up to the roof of the gate unto 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 tidings in his mouth. And he came apace, and drew near.

And the watchman saw another man running; and the watchman called unto the porter, and said, Behold, another man running alone. And the king said, He also bringeth tidings.

And the watchman said, I think the running of the foremost is like the running of Ahimaaz the son of Zadok. And the king said, He is a good man, and cometh with good tidings.

Now the watchman was standing on the tower in Jezreel, and he spied the company of Jehu 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 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, but he cometh not back.

And the watchman told, saying, He came even unto them, and cometh not back: and the driving is like the driving of Jehu the son of Nimshi; for he driveth furiously.

Except Jehovah build the house, They labor in vain that build it: Except Jehovah keep the city, The watchman waketh but in vain.

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

The burden of Dumah. One calleth unto 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 ye: turn ye, come.

Son of man, I have made thee a watchman unto the house of Israel: therefore hear the word at 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 a man from among them, and set him for their watchman;

But if the watchman see the sword come, and blow not the trumpet, and the people be not warned, and the sword come, and take any 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; therefore hear the word at my mouth, and give them warning from me.

Ephraim was a watchman with my God: as for the prophet, a fowler's snare is in all his ways, and enmity in the house of his God.