Numbers 35:16

"But if he smote him with an instrument of iron, so that he died, he is a murderer: the murderer shall surely be put to death. And if he smote him with a stone in the hand, whereby a man may die, and he died, he is a murderer: the murderer shall surely be put to death. Or if he smote him with a weapon of wood in the hand, whereby a man may die, and he died, he is a murderer: the murderer shall surely be put to death. The avenger of blood shall himself put the murderer to death: when he meeteth him, he shall put him to death. And if he thrust him of hatred, or hurled at him, lying in wait, so that he died, or in enmity smote him with his hand, so that he died; he that smote him shall surely be put to death; he is a murderer: the avenger of blood shall put the murderer to death, when he meeteth him."

Here we are given a group of situations in which the blood guilt of an offender must be assumed. Note the frequency of the stern words, "The murderer shall surely be put to death!" This is God's law; it was not a new law, but merely a re-affirmation of the Divine order given to Noah and his posterity in Genesis 9:6. Modern man is nowhere at fault quite so much as he is in the casual manner of his lenience with murderers.