Ezekiel 33:1-4

And the word of the Lord came to me, saying, Son of man, give a word to the children of your people, and say to them, When I make the sword come on a land, if the people of the land take a man from among their number and make him their watchman: If, when he sees the sword coming on the land, by sounding the horn he gives the people news of their danger; Then anyone who, hearing the sound of the horn, does not take note of it, will himself be responsible for his death, if the sword comes and takes him away.