Halakhah for Sanhedrin 3:7
גָּמְרוּ אֶת הַדָּבָר, הָיוּ מַכְנִיסִין אוֹתָן. הַגָּדוֹל שֶׁבַּדַּיָּנִים אוֹמֵר, אִישׁ פְּלוֹנִי אַתָּה זַכַּאי, אִישׁ פְּלוֹנִי אַתָּה חַיָּב. וּמִנַּיִן לִכְשֶׁיֵּצֵא אֶחָד מִן הַדַּיָּנִים לֹא יֹאמַר אֲנִי מְזַכֶּה וַחֲבֵרַי מְחַיְּבִין אֲבָל מָה אֶעֱשֶׂה שֶׁחֲבֵרַי רַבּוּ עָלָי, עַל זֶה נֶאֱמַר לֹא תֵלֵךְ רָכִיל בְּעַמֶּךָ (ויקרא יט), וְאוֹמֵר הוֹלֵךְ רָכִיל מְגַלֶּה סּוֹד (משלי יא):
When they (beth-din) finished the matter, they would bring them [the litigants] in. [For after hearing their claims, they would take them out so that they (beth-din) could deliberate and the litigants not hear who ruled liable and who not liable.] The senior judge would say: "So and so, you are not liable; so and so, you are liable." And whence is it derived that when one of the judges goes out, he should not say: "I found you not liable, but my colleagues found you liable. What can I do? They are the majority." From (Leviticus 19:16): "Do not go as a tale-bearer among your people," and (Proverbs 11:13): "He who reveals a secret is a tale-bearer."