'Watchman' in the Bible

that there is a word of Jehovah unto me, saying, 'Son of man, a watchman I have given thee to the house of Israel, and thou hast heard from My mouth a word, and hast warned them from Me.

Son of man, speak unto the sons of thy people, and thou hast said unto them: A land -- when I bring in against it a sword, And the people of the land have taken one man out of their borders, And made him to them for a watchman.

And the watchman, when he seeth the sword coming in, And he hath not blown with a trumpet, And the people hath not been warned, And come in doth a sword, And taketh away of them -- a soul, He in his iniquity is taken away, And his blood from the hand of the watchman I require.

And thou, son of man, A watchman I gave thee to the house of Israel, And thou hast heard from My mouth a word, And thou hast warned them from Me.