Reference for Makhshirin 2:7

מָצָא בָהּ תִּינוֹק מֻשְׁלָךְ, אִם רֹב נָכְרִים, נָכְרִי. וְאִם רֹב יִשְׂרָאֵל, יִשְׂרָאֵל. מֶחֱצָה לְמֶחֱצָה, יִשְׂרָאֵל. רַבִּי יְהוּדָה אוֹמֵר, הוֹלְכִין אַחַר רֹב הַמַּשְׁלִיכִין:

[If] one found an abandoned child there [in the city]: If most [of the residents] are gentiles it is a gentile; and if most are Jews it is a Jew; [and if] it is half and half it is a Jew. Rabbi Yehudah says: We follow the majority of people who abandon [children].

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