“When I say to the wicked, ‘Wicked one, you will certainly die,’ and you did not speak to warn the wicked from his way, he, the wicked, will die by his guilt, but his blood I will seek from your hand.” (Ezekiel 33:8, LEB)
It is our responsibility as Christians to warn those that are unsaved and living a life of sin and are on a path of evil to repent. If they choose not to repent then it is his blood that is on his hands not on our hands. Yet if we choose not to and ignore the sinner, their blood is on our hands. Christ Jesus even tells us this when he told us that we must produce good fruit as part of the vine.