Cursed is he who strikes down his neighbor in secret.' And let all the people say, 'Amen!'

Exodus 21:12
Whoever strikes and kills a man must surely be put to death.

Leviticus 24:17
And if a man takes the life of anyone else, he must surely be put to death.

Numbers 35:30
If anyone kills a person, the murderer is to be put to death on the testimony of the witnesses. But no one is to be put to death based on the testimony of a lone witness.

Numbers 35:31
You are not to accept a ransom for the life of a murderer who deserves to die; he must surely be put to death.

Cursed be he that smites his neighbor secretly. And all the people shall say, Amen.