30 Whoever kills a man, you shall kill the murderer on the testimony of witnesses; and one witness shall not testify against a soul that he should die.
Numbers 35:30 Cross References - LXX2012
Numbers 35:16
16 And if he should strike him with an iron instrument, and the man should die, he is a murderer; let the murderer by all means be put to death.
Deuteronomy 17:6-7
6 He shall die on the testimony of two or three witnesses; a man who is put to death shall not be put to death for one witness.
7 And the hand of the witnesses shall be upon him among the first to put him to death, and the hand of the people at the last; so shall you remove the evil one from among yourselves.
Deuteronomy 19:15
15 One witness shall not stand to testify against a man for any iniquity, or for any fault, or for any sin which he may commit; by the mouth of two witnesses, or by the mouth of three witnesses, shall every word be established.