Charles Spurgeon Commentary Ezekiel 33:8

"When I say unto the wicked, O wicked man, thou shalt surely die, and thou dost not speak to warn the wicked from his way; that wicked man shall die in his iniquity, but his blood will I require at thy hand." — Ezekiel 33:8 (ASV)

Even as God required Abel's blood at the hand of Cain, and pronounced him cursed because he was guilty of that blood, so will he require the blood of perishing men at the hands of those set over them, and a curse shall come upon them if they are found negligent.