'Warn' in the Bible
"Son of Man," he said, "I've appointed you to be a watchman over the house of Israel. Therefore when you hear a message that comes from me, you are to warn them for 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.
Now if a righteous person turns from his righteousness and practices iniquity, and I put a stumbling block in front of him, he will die. If you did not warn him, he will die because of his sin and the righteous acts he did will not be remembered. Yet I will hold you responsible for his blood.
Nevertheless if thou warn the righteous man, that the righteous sin not, and he doth not sin, he shall surely live, because he is warned; also thou hast delivered thy soul.
If when he seeth the sword come upon the land, he blow the trumpet, and warn the people;
But suppose the watchman sees the sword coming and does not blow the trumpet to warn the people. Then the sword comes and takes one of their lives. He is swept away for his iniquity, but I will hold the watchman accountable for that person's death.'
So thou, O son of man, I have set thee a watchman unto the house of Israel; therefore thou shalt hear the word at my mouth, and warn them from me.
When I say unto the wicked, O wicked man, thou shalt surely die; if thou dost not speak to warn the wicked from his way, that wicked man shall die in his iniquity; but his blood will I require at thine hand.