When you're a watchman is on the wall

And the enemy is seen

You must blow the trumpet

So prepared the people will be

If you blow and the people don't listen

What else can you do?

But if you fail to warn them

Their blood will fall on you.

Ezekiel 3:17-19

 Son of man, I have made thee a watchman unto the house of Israel: therefore hear the word at my mouth, and give them warning from me. 

 When I say unto the wicked, Thou shalt surely die; and thou givest him not warning, nor speakest to warn the wicked from his wicked way, to save his life; the same wicked man shall die in his iniquity; but his blood will I require at thine hand. 

 Yet if thou warn the wicked, and he turn not from his wickedness, nor from his wicked way, he shall die in his iniquity; but thou hast delivered thy soul.