'Watchman' in the Bible

"Son of man, I have appointed you a watchman for the house of Israel. Whenever you hear a word from my mouth, you must give them a warning from me.

"Son of man, speak to your people, and say to them, 'Suppose I bring a sword against the land, and the people of the land take one man from their borders and make him their watchman.

But suppose the watchman sees the sword coming and does not blow the trumpet to warn the people. Then the sword comes and takes one of their lives. He is swept away for his iniquity, but I will hold the watchman accountable for that person's death.'

"As for you, son of man, I have made you a watchman for the house of Israel. Whenever you hear a word from my mouth, you must warn them on my behalf.