Ezekiel 33:2-5

2“Son of man, speak to the sons of your people [who are exiled in Babylon] and say to them, ‘If I bring a sword on a land, and the people of the land take one man from among them and make him their watchman,

3and he sees the sword coming on the land, and he blows the trumpet and warns the people,

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

5He heard the sound of the trumpet but did not take warning; his blood shall be on himself. But if he had taken warning, he would have saved his life.