Cross reference
Exodus 21:23
23 But if any harm follow, then thou shalt give life for life,
Deuteronomy 19:21
21 And thine eyes shall not pity; life `shall go' for life, eye for eye, tooth for tooth, hand for hand, foot for foot.
Leviticus 24:19
19 And if a man cause a blemish in his neighbor; as he hath done, so shall it be done to him:
Numbers 35:31
31 Moreover ye shall take no ransom for the life of a murderer, that is guilty of death; but he shall surely be put to death.