Jerusalem Talmud Kiddushin 4.7

משנה: הָאוֹמֵר בְּנִי זֶה מַמְזֵר אֵינוֹ נֶאֱמָן. וַאֲפִילוּ שְׁנֵיהֶן אוֹמְרִין עַל הָעוֹבֵר שֶׁבְּמֵיעֵיהָ מַמְזֵר הוּא אֵינָן נֶאֱמָנִין. רִבִּי יְהוּדָה אוֹמֵר נֶאֱמָנִין.

MISHNAH: If somebody says, this my son is a bastard, he cannot be believed. Even if both of them say about the fetus in her belly that he is a bastard, they cannot be believed. Rebbi Jehudah says, they are believed.

הלכה: הָאוֹמֵר בְּנִי זֶה מַמְזֵר אֵינוֹ נֶאֱמָן כול׳. תַּמָּן תַּנִּינָן. הָאוֹמֵר. בְּנִי זֶה. נֶאֱמָן. רִבִּי אַבָּהוּ בְשֵׁם רִבִּי יוֹחָנָן. לָתֵת לוֹ אֲבָל לֹא לִיקַּח מִמֶּנּוּ. אָמַר רִבִּי יוֹסֵי. וְלָא מַתְנִיתָא הִיא. אֲפִילוּ שְׁנֵיהֶן אוֹמְרִין עַל הָעוֹבֵר שֶׁבְּמֵעֵיהָ מַמְזֵר הוּא אֵינָן נֶאֱמָנִין. דִּילְמָא עַל דְּרִבִּי יְהוּדָה אִיתְאֲמָרַת. דְּרִבִּי יוּדָה אוֹמֵר. נֶאֱמָנִין עָלֶיהָ. רִבִּי אַבָּהוּ בְשֵׁם רִבִּי יוֹחָנָן. לָתֵת לוֹ אֲבָל לֹא לִיקַּח מִמֶּנּוּ. אָמַר רִבִּי חִזְקִיָּה. עוֹד הִיא מַתְנִיתָא. כִּי אֶת הַבְּכוֹר בֶּן הַשְּׂנוּאָה יַכִּיר. הָיוּ מַחֲזִיקִים בּוֹ שֶׁהוּא בְנוֹ וּבִשְׁעַת מִיתָתוֹ אָמַר. אֵינוֹ בְנוֹ. אֵינוֹ נֶאֱמָן. שֶׁאֵינוֹ בְנוֹ וּבִשְׁעַת מִיתָתוֹ אָמַר. בְּנִי הוּא. נֶאֱמָן. אִית תַּנָּיֵי תַנֵּי. עַל קַדְמִיָיתָא נֶאֱמָן. רִבִּי חִזְקִיָּה רִבִּי זְרִיקָן בְּשֵׁם רִבִּי הוּנָא. הָיוּ מַחֲזִיקִין אוֹתוֹ שֶׁהוּא מִשִּׁפְחָתוֹ נֶאֱמָן. הָיָה עוֹמֵד בְּצַד הַמּוּכְסִין וְאָמַר. בְּנִי הוּא. וְחָזַר וְאָמַר עַבְדִּי הוּא. נֶאֱמָן. עַבְדִּי הוּא. וְחָזַר וְאָמַר בְּנִי הוּא. אֵינוֹ נֶאֱמָן. אִית תַּנָּיֵי תַנֵּי. נֶאֱמָן. אָמַר רִבִּי מָנָא. בְּגִין אִילֵּין כּוּתָאֵי דִּינּוּן מְשַׁעְבְּדִין בִּבְנֵיהֶן.

HALAKHAH: “If somebody says, this my son is a bastard, he cannot be believed,” etc. There, we have stated: “If somebody said, this is my son, he is to be believed.” Rebbi Abbahu in the name of Rebbi Joḥanan: To give him, but not to take from him. Rebbi Yose said, is that not the Mishnah: “Even if both of them say about the fetus in her belly that he is a bastard, they cannot be believed”? Maybe it was said following Rebbi Jehudah, for Rebbi Jehudah said, they can be believed; Rebbi Abbahu in the name of Rebbi Joḥanan: To give him, but not to take from him. Rebbi Ḥizqiah said, still it is a baraita: “For he has to recognize the firstborn, the son of the hated one.” If they maintained that he was his son but at the moment of his death he said that he was not his son, he cannot be believed. That he was not his son but at the moment of his death he said that he was his son, he is believed. Some Tannaïm state on the first case that he is believed. Rebbi Ḥisqiah, Rebbi Zeriqan in the name of Rebbi Huna: If they maintained that he was from his slave girl, he is believed. If he was standing next to the customs collectors and said, he is my son, but later he said, he is my slave, he is believed. He is my slave, but later he said, he is my son, he is not believed. Some Tannaïm state, he is believed. Rebbi Mana said, because of those Samaritans who use their sons as slaves.

תַּנֵּי. נֶאֱמָן עַל הַגָּדוֹל וְאֵינוֹ נֶאֱמָן עַל הַקָּטָן. אֵי זֶהוּ גָדוֹל. רִבִּי זְעִירָא אָמַר. כָּל שֶׁיֵּשׁ לוֹ אִשָּׁה וּבָנִים. רִבִּי אַבָּהוּ. כָּל שֶׁיֵּשׁ לוֹ אֲשָָּׁה. מַתְנִיתָא פְלִיגָא עַל רִבִּי אַבָּהוּ. גֵּר שֶׁמָּל וְלֹא טָבַל וְהָיוּ לוֹ בָנִים וְאָמַר. מַלְתִּי וְלֹא טָבַלְתִּי. נֶאֱמָן וּמַטְבִּילִין אוֹתוֹ בַּשַּׁבָּת. מִשֻּׁם מֵהַנְכָּיָיה. דִּבְרֵי רַב יוּדָה. מָה עֲבַד לָהּ רִבִּי אַבָּהוּ. פָּתַר לָהּ. מִשֻּׁם מַה בְכָךְ.

It was stated: He is believed about the adult but is not believed about the young. Who is adult? Rebbi Ze‘ira said, any one who has a wife and children; Rebbi Abbahu, any one who has a wife. A baraita disagrees with Rebbi Abbahu: A proselyte who was circumcised but did not immerse himself but has children; if he said, I was circumcised but did not immerse, he is believed and one immerses him even on the Sabbath because of parsimony, the words of Rav Jehudah. What does Rebbi Abbahu do with this? He explains it, because who cares?