It is better and more satisfactory to acquit a thousand guilty persons than to put a single innocent one to death.
(ה) הוו יודעין שלא כדיני ממונות דיני נפשות. דיני ממונות, אדם נותן ממון ומתכפר לו. דיני נפשות, דמו ודם זרעיותיו תלוין בו עד סוף העולם, שכן מצינו בקין שהרג את אחיו, שנאמר (בראשית ד, י) דמי אחיך צעקים, אינו אומר דם אחיך אלא דמי אחיך, דמו ודם זרעיותיו. דבר אחר, דמי אחיך, שהיה דמו משלך על העצים ועל האבנים.
לפיכך נברא אדם יחידי, ללמדך, שכל המאבד נפש אחת, מעלה עליו הכתוב כאלו אבד עולם מלא. וכל המקים נפש אחת , מעלה עליו הכתוב כאלו קים עולם מלא.
(5) Know that capital cases are not like monetary ones. In monetary cases, (a false witness) can return the money and achieve atonement. But in capital cases, his blood and the blood of all his future offspring hang upon you until the end of time. For thus we find in regard to Cain, who killed his brother, "The bloods of your brother scream out!" - the verse does not say blood of your brother, but bloods of your brother, because it was his blood and also the blood of his future offspring (screaming out)!
It was for this reason that man was first created as one person (viz. Adam), to teach you that anyone who destroys a life is considered by Scripture to have destroyed an entire world; any any who saves a life is as if he saved an entire world."
The Mishnah allows capital punishment for a number of very specific crimes (Mishnah Sanhedrin 7:4). Only the Sanhedrin, or high court of Jewish law, may judge capital cases, and they stopped doing so around the year 30 C.E. (Sanhedrin 41a and parallels). Nonetheless, the sages of the Talmud continued to discuss capital punishment and to oppose it. Indeed, they added so many conditions that it would be almost impossible to execute a person.
Both in concept and practice, Jewish tradition found capital punishment repugnant, despite Biblical sanctions for it. For the past 2,000 years, with the rarest of exceptions, Jewish courts have refused to punish criminals by depriving them of their lives.
(י) סנהדרין ההורגת אחד בשבוע נקראת חבלנית. רבי אלעזר בן עזריה אומר, אחד לשבעים שנה.רבי טרפון ורבי עקיבא אומרים, אלו היינו בסנהדרין לא נהרג אדם מעולם.רבן שמעון בן גמליאל אומר, אף הן מרבין שופכי דמים בישראל.
(10) A Sanhedrin that would execute somebody once every seven years is a bloody court. Rabbi Elazar Ben Azariah says: "Once every 70 years." Rabbi Tarfon and Rabbi 'Akiva said: "If we were on the Sanhedrin we would never have killed anyone!" Rabban Shim'on Ben Gamliel said: "They would have increased violence in Israel."
והאי תנא הוא דתניא ושאר כל חייבי מיתות שבתורה אין ממיתין אותם אלא בעדה ועדים והתראה ועד שיודיעוהו שהוא חייב מיתה בבית דין ר' יהודה אומר עד שיודיעוהו באיזה מיתה הוא נהרג
Those who are liable for the various death penalties stated in the Torah, the court executes them only when the following elements are present: The congregation, represented by the court of 23 judges; and 2 witnesses; and forewarning just before the defendant commits the transgression. And the court does not execute him unless the witnesses had informed the defendant that he is liable to receive the death penalty from the court. Rabbi Yehuda says: The defendant is not executed unless the witnesses had informed the defendant by which form of the death penalty he is to be killed.
― Isabel Wilkerson, Caste: The Origins of Our Discontents
As a shepherd herds his flock,
Causing his sheep to pass beneath his staff,
So do You cause to pass, count, and record,
Visiting the souls of all living,
Decreeing the length of their days,
Inscribing their judgment.
On Rosh Hashanah it is written,
And on Yom Kippur it is sealed.
How many shall pass away and how many shall be born,
Who shall live and who shall die,
Who shall reach the end of his days and who shall not...
But repentance, prayer and righteousness avert the severe decree.
For Your praise is in accordance with Your name. You are difficult to anger and easy to appease. For You do not desire the death of the condemned, but that he turn from his path and live.
Until the day of his death You wait for him. Should he turn, You will receive him at once. In truth You are their Creator and You understand their inclination, for they are but flesh and blood.