'Guard' in the Bible

yea, he casteth out the man, and causeth to dwell at the east of the garden of Eden the cherubs and the flame of the sword which is turning itself round to guard the way of the tree of life.

Of the thirty he is honoured, and unto the three he came not; and David setteth him over his guard.

Of the thirty, lo, he is honoured, and unto the first three he hath not come, and David setteth him over his guard.

Also, at that time I said to the people, 'Let each with his servant lodge in the midst of Jerusalem, and they have been to us by night a guard, and by day for the work:'

and there are none -- I and my brethren and my servants, the men of the guard who are after me -- there are none of us putting off our garments, each hath his vessel of water.

and I say to them, 'Let not the gates of Jerusalem be opened till the heat of the sun, and while they are standing by let them shut the doors, and fasten, and appoint guards of the inhabitants of Jerusalem, each in his guard, and each over-against his house.'

A sea -monster am I, or a dragon, That thou settest over me a guard?

in the three and twentieth year of Nebuchadrezzar, hath Nebuzar-Adan chief of the guard removed of Jewish souls, seven hundred forty and five; all the souls are four thousand and six hundred.

Be prepared, yea, prepare for thee, Thou and all thine assemblies who are assembled unto thee, And thou hast been to them for a guard.