English: “You shall not spare and you shall not conceal him” — The Sages taught the ordinary rules of reopening a capital case for new evidence of innocence or guilt. Rav Shimi bar Ashi said: The opposite applies to a mesis.
On the daf / in context: For a mesis the ordinary protective rules of capital procedure are reversed: new evidence of innocence does not reopen the case in the same way.
Type of Learning
Derash on the verse (Sanhedrin) — the procedural protections are inverted for the mesis.
What Is Learned
The ordinary rules that favor the accused in capital cases are reversed when the accused is a mesis.