Pesachim9: 10
שְׁתֵּי חֲבוּרוֹת שֶׁנִּתְעָרְבוּ פִסְחֵיהֶן — אֵלּוּ מוֹשְׁכִין לָהֶן אֶחָד וְאֵלּוּ מוֹשְׁכִין לָהֶן אֶחָד; אֶחָד מֵאֵלּוּ בָּא לוֹ אֵצֶל אֵלּוּ, וְאֶחָד מֵאֵלּוּ בָּא לוֹ אֵצֶל אֵלּוּ, וְכָךְ הֵם אוֹמְרִים: ,,אִם שֶׁלָּנוּ הוּא הַפֶּסַח הַזֶּה — יָדֶיךָ מְשׁוּכוֹת מִשֶּׁלָּךְ וְנִמְנֵיתָ עַל שֶׁלָּנוּ; וְאִם שֶׁלְּךָ הוּא הַפֶּסַח הַזֶּה — יָדֵינוּ מְשׁוּכוֹת מִשֶּׁלָּנוּ וְנִמְנִינוּ עַל שֶׁלָּךְ”. וְכֵן חָמֵשׁ חֲבוּרוֹת שֶׁל חֲמִשָּׁה חֲמִשָּׁה וְשֶׁל עֲשָׂרָה עֲשָׂרָה, מוֹשְׁכִין לָהֶן אֶחָד מִכָּל חֲבוּרָה וַחֲבוּרָה, וְכֵן הֵם אוֹמְרִים.
[If] the pesach-offerings of two groups were confused, these take one for themselves, and the others take one for themselves. [Then] a member of one group comes to the other group, and a member of the other group comes to this group, and they declare the following, “If this pesach is ours, [then] you are withdrawn from your own [pesach] and you are registered on ours. But if this pesach is yours, then we withdraw from ours and we are registered on yours.”  Similarly, if there were five groups, each comprising five or ten [members], they take to themselves one person from each group and declare the same.
Pesachim9: 11
שְׁנַיִם שֶׁנִּתְעָרְבוּ פִסְחֵיהֶם — זֶה מוֹשֵׁךְ לוֹ אֶחָד וְזֶה מוֹשֵׁךְ לוֹ אֶחָד; זֶה מַמְנֶה עִמּוֹ אֶחָד מִן הַשּׁוּק, וְזֶה מַמְנֶה עִמּוֹ אֶחָד מִן הַשּׁוּק; זֶה בָא אֵצֶל זֶה וְזֶה בָא אֵצֶל זֶה, וְכָךְ הֵם אוֹמְרִים: ,,אִם שֶׁלִּי הוּא פֶּסַח זֶה — יָדֶיךָ מְשׁוּכוֹת מִשֶּׁלָּךְ וְנִמְנֵיתָ עַל שֶׁלִּי; וְאִם שֶׁלְּךָ הוּא פֶּסַח זֶה — יָדַי מְשׁוּכוֹת מִשֶּׁלִּי וְנִמְנֵיתִי עַל שֶׁלָּךְ”.
Two [individuals] whose pesach-offerings were confused, this one takes one (pesach) for himself, and that one takes one for himself; this one registers some stranger with himself, and that one registers some stranger with himself; this one comes to that [pesach] and that one comes to this [pesach], and they say thus, “If this pesach-offering is mine, [then] you are withdrawn from yours and are registered upon mine; and if that pesach-offering is yours, I am withdrawn from mine and am registered upon yours.”