Ezekiel 33:2-5

“Son of man, give your people this message: ‘If I bring war to your nation, you must select a man and post him as a watchman. When he sees the enemy coming to attack, he must sound his shofar to warn the people. If people hear the warning but pay no attention and the sword overtakes them and kills them, they will bear the responsibility for their own deaths. Because they heard the sound of the shofar and paid no attention to the warning, their deaths are their own faults. But if they had listened to the warning, they could have saved their lives.