Ezekiel 33:2-5

2Son of man, speak to the children of thy people, and say unto them, When I bring the sword upon a land, and the people of the land take a man from among them, and set him for their watchman;

3if, when he seeth the sword come upon the land, he blow the trumpet, and warn the people;

4then whosoever heareth the sound of the trumpet, and taketh not warning, if the sword come, and take him away, his blood shall be upon his own head.

5He heard the sound of the trumpet, and took not warning; his blood shall be upon him; whereas if he had taken warning, he would have delivered his soul.