Ezekiel 33 (KJV)

6 But if the watchman see the sword come, and blow not the trumpet, and the people be not warned; if the sword come, and take any person from among them, he is taken away in his iniquity (wickedness); but his blood will I require at the watchman's hand.

8 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 (wickedness); but his blood will I require at thine hand.