Jerusalem Talmud Pesachim 8.2

משנה: הָאוֹמֵר לְעַבְדּוֹ צֵא וּשְׁחוֹט עָלַי אֶת הַפֶּסַח. שָׁחַט גְּדִי יֵאָכֵל שָׁחַט טָלֶה יֵאָכֵל. שָׁחַט גְּדִי וְטָלֶה יֹאכַל מִן הָרִאשׁוֹן. שָׁכַח מָה אָמַר לוֹ רַבּוֹ כֵּיצַד יַעֲשֶׂה. יִשְׁחוֹט גְּדִי וְטָלֶה וְיֹאמַר אִם גְּדִי אָמַר לִי רַבִּי גְּדִי שֶׁלוֹ וְטָלֶה שֶׁלִי. וְאִם טָלֶה אָמַר לִי רַבִּי טָלֶה שֶׁלּוֹ וּגְדִי שֶׁלִּי. שָׁכַח רַבּוֹ מָה אָמַר לוֹ שְׁנֵיהֶן יֵצְאוּ לְבֵית הַשְּרֵפָה וּפְטוּרִין מִלַּעֲשׂוֹת פֶּסַח שֵׁנִי:

MISHNAH: One says to his slave, go and slaughter the Pesaḥ for me. If he slaughtered a kid goat, it should be eaten; if he slaughtered a lamb, it should be eaten. If he slaughtered kid goat and lamb, one eats from the first. If he forgot what his master had told him, what can he do? He shall slaughter a kid goat and a lamb and say, if my master said to me a kid goat, the kid goat is his and the lamb mine, but if my master said to me a lamb, the lamb is his and the kid goat mine. If his master had forgotten what he told him, both shall be brought to the place of burning but they are free from bringing the Second Pesaḥ.

הלכה: תַּנֵּי רִבִּי חִיָיה. הַנִּמְנֶה עַל שְׁנֵי פְסָחִין כְּאַחַת אוֹכֵל מֵאֵי זֶה מֵהֶן שֶׁנִּשְׁחַט רִאשׁוֹן. אָמַר רִבִּי יוֹסֵה. מַתְנִיתָא אָמְרָה כֵן. שָׁחַט גְּדִי וְטָלֶה יֹאכַל מִן הָרִאשׁוֹן. רִבִּי לָעְזָר וְרִבִּי יוֹחָנָן תְּרֵיהוֹן אָמְרִין. דְּרִבִּי נָתָן הִיא. דְּרִבִּי נָתָן אָמַר. יוֹצְאִין בִּזְרִיקָה בְלֹא אֲכִילָה. רִבִּי חִזְקִיָּה בְשֵׁם רִבִּי בָּא בַּר מָמָל. תִּיפְתָּר שֶׁשָּׁכַח רַבּוֹ בֵּין שְׁחִיטָה לַזְּרִיקָה. אָמַר רִבִּי חִזְקִיָּה. מָתִיב חַד מִן רַבָּנִן. וְאָמְרִין. הוּא הֲוָה. וְהָא תַנִּינָן. שָׁכַח רַבּוֹ מָה אָמַר לוֹ. יִשְׁחוֹט גְּדִי וְטָלֶה.

HALAKHAH: Rebbi Ḥiyya stated: One who simultaneously subscribed to two Pesaḥim eats from the one which was slaughtered first. Rebbi Yose said, the Mishnah implies this; “if he slaughtered kid goat and lamb, one eats from the first.” Rebbi Eleazar and Rebbi Joḥanan both are saying, this is Rebbi Nathan’s since Rebbi Nathan said, one fulfills his obligation by pouring without eating. Rebbi Ḥizqiah in the name of Rebbi Abba bar Mamal: Explain it that the master forgot between slaughter and pouring. Rebbi Ḥizqiah said, one of the rabbis objected; some say that it was himself: Did we not state, “If he forgot what his master had told him, he shall slaughter a kid goat and a lamb”?

אָמַר רִבִּי יוֹחָנָן. הִפְרִישׁ פִּסְחוֹ עַד שֶׁלֹּא נִתְגַּיֵיר וְנִתְגַּיֵיר. עַד שֶׁלֹּא נִשְׁתַּחְרֵר וְנִשְׁתַּחְרֵר. עַד שֶׁלֹּא הֵבִיא שְׁתֵּי שְׂעָרוֹת וְהֵבִיא שְׁתֵּי שְׂעָרוֹת. צָרִיךְ לְהִימָּנוֹת עַל פֶּסָח אַחֵר. אָמַר רִבִּי יוּדָן. כָּל הַסְּפֵיקוֹת דְּרִבִּי נָתָן אִינּוּן. חוּץ מִן הַזֻּוֹרֵק דַּם חַטָּאתוֹ וְדַם אֲשָׁמוֹ. סָפֵק בַּלַּיְלָה זָרַק סָפֵק בַּיּוֹם זָרַק. נַעֲשֶׂה כִּסְפֵק כַפָּרָה. וּסְפֵק כַפָּרָה כִיפֵּר.

Rebbi Joḥanan said, if he dedicated a Pesaḥ before he converted and then converted, before he was manumitted and then was manumitted, before he grew two pubic hairs and then grew two pubic hairs, has to subscribe to another Pesaḥ. Rebbi Yudan said, all doubts follow Rebbi Nathan, except for him who pours the blood of his purification offering or the blood of his reparation offering when there is a doubt whether he poured during nighttime or poured during daytime, where there is a doubt of atonement, and every doubt of atonement atones.