Ezekiel 3:18, 20

When I say to the wicked, ‘You will certainly die,’ and you do not warn him or speak out to tell him to turn from his wicked way to save his life, that same evil man will die in his sin, but you will be responsible for his blood.

Again, when a righteous man turns from his righteousness (right standing with God) and sins, and I place an obstacle before him, he will die; since you have not warned him, he will die in his sin, and the righteous deeds which he has done will not be remembered; but you will be responsible for his blood.