'Warning' in the Bible

Son of man, I have appointed thee a watchman unto the house of Israel, and thou shalt hear the word from my mouth, and give them warning from me.

When I say unto the wicked, Thou shalt certainly die; and thou givest him not warning, nor speakest to warn the wicked from his wicked way, that he may live: the same wicked man shall die in his iniquity; but his blood will I require at thy hand.

And when a righteous man doth turn from his righteousness, and do what is wrong, and I lay a stumbling-block before him, he shall die; because thou hast not given him warning, he shall die in his sin, and his righteous acts which he hath done shall not be remembered; but his blood will I require at thy hand.

And if thou warn the righteous man, that the righteous sin not, and he doth not sin, he shall certainly live, for he hath taken warning; and thou hast delivered thy soul.

then 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.

He 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.