It turns out, that idea is deeply rooted in Jewish tradition, as we find in Sifrei Bamidbar, a collection of legal interpretations on the Book of Numbers.

Specifically, we're looking at Numbers 35:26-28, dealing with the laws of accidental manslaughter and cities of refuge. These cities were designated places where someone who unintentionally killed another person could flee and find sanctuary from the victim's blood avenger – the go’el ha-dam, usually a relative tasked with seeking retribution.

Now, the verse states: "And if the murderer go beyond the border of the city of refuge…the avenger may slay the murderer." Rabbi Elazar b. Azaryah takes this seemingly harsh law and spins it into something profound. He says, essentially, that if someone is punished for stepping just one step outside the boundary of protection, how much more reward awaits someone who takes an "extra step" to perform a mitzvah, a good deed?

Isn’t that a powerful thought? If the smallest transgression brings consequences, imagine the immense potential for good contained in even the smallest act of kindness or devotion! It’s a reminder that every action, no matter how small, carries weight.

The text continues, clarifying who is allowed to avenge the death of the victim. "And the avenger find him" – this doesn't just refer to the literal blood avenger, a relative. It means any man can take action if the killer leaves the city of refuge. This highlights the community's responsibility to uphold justice and protect the sanctity of life.

What happens if someone commits manslaughter within the city of refuge itself? Well, according to Sifrei Bamidbar, "If one killed in that city…he is exiled from one neighborhood (in that city) to another." Even within the sanctuary, there are consequences. A Levite, a member of the priestly tribe, living in a city of refuge would be exiled from that city to another. There's always a need for accountability, even within a system of mercy.

Finally, there's the question of what happens after the High Priest dies. The verse states, "and after the death of the high-priest, the slayer shall return to the land of his holding." But, does this mean the killer returns to their previous position? Here, we have a disagreement between Rabbi Yehudah and Rabbi Meir. Rabbi Yehudah says no, they don't get their old status back. But Rabbi Meir argues that they do return even to their former position.

This disagreement touches upon themes of forgiveness, redemption, and the possibility of complete rehabilitation after making a terrible mistake. Does society permanently mark someone who committed accidental manslaughter, or is there room for complete restoration? It’s a question that resonates even today.

So, what can we take away from this exploration of ancient law? It's more than just legal technicalities. It's about the importance of every action, the responsibility of community, and the enduring tension between justice and mercy. And maybe, just maybe, it's a reminder that one small step – whether in the wrong direction or the right one – can truly change everything.