Ezekiel 33:6

“When I say to the wicked, ‘You will surely die,’ and you do not warn him or speak out to warn the wicked from his wicked way that he may live, that wicked man shall die in his iniquity, but his blood I will require at your hand.

But when they resisted and blasphemed, he shook out his garments and said to them, “Your blood be on your own heads! I am clean. From now on I will go to the Gentiles.”

For if the trumpet produces an indistinct sound, who will prepare himself for battle?