'Watchman' in the Bible

Son of man, I have made you a watchman for the children of Israel: so give ear to the word of my mouth, and give them word from me of their danger.

Son of man, give a word to the children of your people, and say to them, When I make the sword come on a land, if the people of the land take a man from among their number and make him their watchman:

But if the watchman sees the sword coming, and does not give a note on the horn, and the people have no word of the danger, and the sword comes and takes any person from among them; he will be taken away in his sin, but I will make the watchman responsible for his blood.

So you, son of man, I have made you a watchman for the children of Israel; and you are to give ear to the word of my mouth and give them news from me of their danger.