Bava Basra3: 4
הָיוּ שְׁנַיִם מְעִידִין אוֹתוֹ שֶׁאֲכָלָהּ שָׁלֹשׁ שָׁנִים, וְנִמְצְאוּ זוֹמְמִין — מְשַׁלְּמִין לוֹ אֶת הַכֹּל. שְׁנַיִם בָּרִאשׁוֹנָה, וּשְׁנַיִם בַּשְּׁנִיָּה, וּשְׁנַיִם בַּשְּׁלִישִׁית — מְשַׁלְּשִׁין בֵּינֵיהֶם. שְׁלֹשָׁה אַחִים, וְאֶחָד מִצְטָרֵף עִמָּהֶם — הֲרֵי אֵלּוּ שָׁלֹשׁ עֵדֻיּוֹת, וְהֵן עֵדוּת אַחַת לַהֲזָמָה.
[If] two [witnesses] testified on his behalf that he ate its [produce] three years, and they were found to be zomemim, they pay him everything. [If] two [testified] concerning the first [year], two concerning the second [year], and two concerning the third [year], they divide it in three among them. [If they were] three brothers, and one joined with them, these are three testimonies; but they are one testimony in regard to hazamah.