"Now if a person sins after he hears a public adjuration to testify when he is a witness, whether he has seen or otherwise known, if he does not tell it, then he will bear his guilt." (Leviticus 5:1)
"you shall surely strike the inhabitants of that city with the edge of the sword, utterly destroying it and all that is in it and its cattle with the edge of the sword." (Deuteronomy 13:15)
"If anyone kills a person, the murderer shall be put to death at the evidence of witnesses, but no person shall be put to death on the testimony of one witness." (Numbers 35:30)
"A single witness shall not rise up against a man on account of any iniquity or any sin which he has committed; on the evidence of two or three witnesses a matter shall be confirmed." (Deuteronomy 19:15)
"Fathers shall not be put to death for their sons, nor shall sons be put to death for their fathers; everyone shall be put to death for his own sin." (Deuteronomy 24:16)