“So you, son of man, I have appointed you as a watchman to the house of Israel. Therefore hear the word from my mouth and give them warning from me. When I say to the wicked, ‘O wicked man, you will surely die,' and you do not speak to warn the wicked from his way, that wicked man will die in his iniquity, but his blood I will require at your hand.”
Ezekiel is reminded that he is God's chosen watchman, appointed to watch on behalf of Israel on whom the sword has been brought. Now he must speak and give warning, for unless they repent, the sword will also come on Israel in exile. Indeed to the exiles God is saying, ‘O wicked man, you will surely die.' It is now up to Ezekiel to warn them and call them to repentance, to a change of heart and mind, with the aim of turning them from their present way. And if he does not do so their blood will be on his hands and God will require it of him. Note that the call is to each individual. There is individual responsibility, and Ezekiel is responsible for each individual.
The same is true for all Christians. We have been made watchmen for the world. We know His truth and the judgments that will come on men. We too are therefore responsible to warn men and to seek to turn them from their evil ways, and if we do not we too will be held responsible for their final death and what they have to face.