King James Version (KJV)
or in enmity struck him down with his hand, so that he died, then he who struck the blow shall be put to death. He is a murderer. The avenger of blood shall put the murderer to death when he meets him.
Modern English
or in hostility struck him with his hand, so that he died, he who struck him shall surely be put to death. He is a murderer. The avenger of blood shall put the murderer to death, when he meets him.