Mishnà su Numeri 9:13
וְהָאִישׁ֩ אֲשֶׁר־ה֨וּא טָה֜וֹר וּבְדֶ֣רֶךְ לֹא־הָיָ֗ה וְחָדַל֙ לַעֲשׂ֣וֹת הַפֶּ֔סַח וְנִכְרְתָ֛ה הַנֶּ֥פֶשׁ הַהִ֖וא מֵֽעַמֶּ֑יהָ כִּ֣י ׀ קָרְבַּ֣ן יְהוָ֗ה לֹ֤א הִקְרִיב֙ בְּמֹ֣עֲד֔וֹ חֶטְא֥וֹ יִשָּׂ֖א הָאִ֥ישׁ הַהֽוּא׃
Ma l'uomo che è pulito, e non è in viaggio, e proibisce di tenere la Pasqua, quell'anima sarà tagliata fuori dal suo popolo; poiché non ha portato l'offerta del Signore nella sua stagione stabilita, quell'uomo sopporterà il suo peccato.
Mishnah Oholot
A kokhin field may neither be planted nor sown, but its earth is regarded as clean and ovens may be made of it for holy use. Bet Shammai and Bet Hillel agree that it [a bet peras in which a grave was plowed over] is examined for one who wished to perform the pesah sacrifice,but is not examined for one who wants to eat terumah. And as for a nazirite: Bet Shammai say: it is examined, But Bet Hillel say: it is not examined. How does he examine it? He brings earth that he can move, and places it into a sieve with fine meshes, and crumbles. If a bone of barley-corn size is found there [the person passing through the field] is deemed unclean.
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