8כָּל עֵד שֶׁהֵעִיד בְּדִינֵי נְפָשׁוֹת אֵינוֹ מוֹרֶה בְּדִין זֶה הַנֶּהֱרָג וְלֹא יְלַמֵּד עָלָיו לֹא זְכוּת וְלֹא חוֹבָה. וְאִם אָמַר יֵשׁ לִי לְלַמֵּד עָלָיו זְכוּת מְשַׁתְּקִין אוֹתוֹ שֶׁנֶּאֱמַר (במדבר לה ל) "וְעֵד אֶחָד לֹא יַעֲנֶה בְנֶפֶשׁ לָמוּת". בֵּין לִזְכוּת בֵּין לְחוֹבָה. וּמַהוּ זֶה שֶׁנֶּאֱמַר לָמוּת כְּלוֹמַר עֵד שֶׁהֵעִיד בְּנֶפֶשׁ לָמוּת לֹא יַעֲנֶה דָּבָר אֶלָּא יָעִיד וְיִשְׁתֹּק. אֲבָל בְּדִינֵי מָמוֹנוֹת יֵשׁ לוֹ לְלַמֵּד עָלָיו זְכוּת אוֹ חוֹבָה. אֲבָל לֹא יִמָּנֶה עִם הַדַּיָּנִים וְלֹא יֵעָשֶׂה דַּיָּן שֶׁאֵין עֵד נַעֲשֶׂה דַּיָּן אֲפִלּוּ בְּדִינֵי מָמוֹנוֹת:
Whenever a witness delivers testimony in a case involving capital punishment, he may not rule as a judge with regard to this murder. He may not offer an opinion in favor of the accused's acquittal or conviction. If he states: "I have a rationale that should lead to his acquittal, he is silenced, as implied by Numbers 35:30: "One witness shall not make a statement with regard to a case involving capital punishment," i.e., his words are not accepted neither for acquittal, nor for conviction. What is the intent of the phrase "involving capital punishment"? That once a witness testifies with regard to capital punishment, he should make no further statements. He should deliver his testimony and be silent. With regard to cases involving financial matters, he may, however, offer an opinion leading to the defendant being released from financial liability or held liable. He may not, however, be counted among the judges or serve as a judge. For a witness may not serve as a judge. This applies even in cases involving financial matters.