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 one man from among them all, and set him for their watchman:

3if he see the sword coming upon the land, and 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 is upon him: whereas had he taken warning, he would have delivered his soul.