Mishnayos Sanhedrin Perek 7 Mishnah 5

One who blasphemes, i.e., one who curses God, is not liable unless he utters the name of God and curses it. Rabbi Yehoshua ben Korḥa said: On every day of a blasphemer’s trial, when the judges judge the witnesses, i.e., interrogate the witnesses, they ask the witnesses to use an appellation for the name of God, so that they do not utter a curse of God’s name. Specifically, the witnesses would say: Let Yosei smite Yosei, as the name Yosei has four letters in Hebrew, as does the Tetragrammaton. When the judgment is over, and the court votes to deem the defendant guilty, they do not sentence him to death based on the testimony of the witnesses in which they used an appellation for the name of God, without having ever heard the exact wording of the curse. Rather, they remove all the people who are not required to be there from the court, so that the curse is not heard publicly, and the judges interrogate the eldest of the witnesses, and say to him: Say what you heard explicitly. And he says exactly what he heard. And the judges stand on their feet and make a tear in their garments, as an act of mourning for the desecration of the honor of God. And they do not ever fully stitch it back together again. And the second witness says: I too heard as he did, but he does not repeat the curse explicitly. And the third witness, in the event that there is one, says: I too heard as he did. In this manner, the repetition of the invective sentence is limited to what is absolutely necessary.

הַמְגַדֵּף אֵינוֹ חַיָּב עַד שֶׁיְּפָרֵשׁ הַשֵּׁם. אָמַר רַבִּי יְהוֹשֻׁעַ בֶּן קָרְחָה, בְּכָל יוֹם דָּנִין אֶת הָעֵדִים בְּכִנּוּי יַכֶּה יוֹסֵי אֶת יוֹסֵי. נִגְמַר הַדִּין, לֹא הוֹרְגִים בְּכִנּוּי, אֶלָּא מוֹצִיאִים כָּל אָדָם לַחוּץ וְשׁוֹאֲלִים אֶת הַגָּדוֹל שֶׁבָּהֶן וְאוֹמְרִים לוֹ אֱמֹר מַה שֶּׁשָּׁמַעְתָּ בְּפֵרוּשׁ, וְהוּא אוֹמֵר, וְהַדַּיָּנִים עוֹמְדִין עַל רַגְלֵיהֶן וְקוֹרְעִין וְלֹא מְאַחִין. וְהַשֵּׁנִי אוֹמֵר אַף אֲנִי כָּמוֹהוּ, וְהַשְּׁלִישִׁי אוֹמֵר אַף אֲנִי כָּמוֹהוּ: