Matthew 5:38
"You have heard that it was said, 'An eye for an eye and a tooth for a tooth.'
An eye for an eye and a tooth for a tooth.
At the beginning of the Law, in Exodus 21, God gives the theocratic rule for personal injury. This rule defines justice in cases where an innocent person is harmed by an offender.
Exodus 21:22–25
When men strive together and hit a pregnant woman, so that her children come out, but there is no harm, the one who hit her shall surely be fined…. But if there is harm, then you shall pay life for life, eye for eye, tooth for tooth, hand for hand, foot for foot, burn for burn, wound for wound, stripe for stripe.
(The same rule is applied to fights in general at Leviticus 24:10, 19–20.)
Immediately following this rule, however, the Law prescribes a merciful outcome in the case where a slave suffers an injury. Jesus will focus on this idea in His teaching.
Exodus 21:26–27
When a man strikes the eye of his slave, male or female, and destroys it, he shall let the slave go free because of his eye. If he knocks out the tooth of his slave, male or female, he shall let the slave go free because of his tooth.
Jesus's focus on a merciful outcome is right, and the Law and Prophets support it. Although Deuteronomy 19:16–21 makes clear the severity of the Law, mercy still triumphs in the end (Ezekiel 20:13–17). For Deuteronomy prescribes "an eye for an eye and a tooth for a tooth" in the case of a false witness, saying, "You shall do to him as he had meant to do to his brother." And the penalty is even firmer when it says, "Your eye shall not pity." But centuries later, God tells Ezekiel that Israel made it to the promised land only because His eye had indeed pitied them.
Deuteronomy 19:21
Your eye shall not pity. It shall be life for life, eye for eye, tooth for tooth, hand for hand, foot for foot.Ezekiel 20:13, 17
But the house of Israel rebelled against me in the wilderness…. Then I said I would pour out my wrath upon them in the wilderness, to make a full end of them….
Nevertheless, my eye spared them, and I did not destroy them or make a full end of them in the wilderness.
The big picture is clear. Mercy triumphs over justice. God desires all to be saved.