Ezekiel 33:2-4

2“Son of man, speak to the children of your people, and say to them: ‘When I bring the sword upon a land, and the people of the land take a man from their territory and make him their watchman,

3when he sees the sword coming upon the land, if he blows the trumpet and warns the people,

4then whoever hears the sound of the trumpet and does not take warning, if the sword comes and takes him away, his blood shall be on his own head.