כלאים ב׳Kilayim 2

Mishnah 1א׳

כָּל סְאָה שֶׁיֶּשׁ בּוֹ רֹבַע מִמִּין אַחֵר, יְמַעֵט. רַבִּי יוֹסֵי אוֹמֵר, יָבֹר. בֵּין מִמִּין אֶחָד בֵּין מִשְּׁנֵי מִינִין. רַבִּי שִׁמְעוֹן אוֹמֵר, לֹא אָמְרוּ אֶלָּא מִמִּין אֶחָד. וַחֲכָמִים אוֹמְרִים, כָּל שֶׁהוּא כִלְאַיִם בַּסְּאָה מִצְטָרֵף לְרֹבַע:

If a se'ah [specific unit of volume] contains one quarter [of a kav] of another species [of seed], the [ratio] must be reduced; Rabbi Yose says: he must pick [all of it out] whether it [the quarter kav] is of one species or two species; Rabbi Shimon says: They only said [the rule that it must be reduced] if there is one species. The Sages say: all that is kilayim within the se'ah combines to make up the quarter kav.

Mishnah 2ב׳

בַּמֶּה דְבָרִים אֲמוּרִים. תְּבוּאָה בִתְבוּאָה וְקִטְנִית בְּקִטְנִית, תְּבוּאָה בְקִטְנִית וְקִטְנִית בִּתְבוּאָה. בֶּאֱמֶת אָמְרוּ, זֵרְעוֹנֵי גִנָּה שֶׁאֵינָן נֶאֱכָלִין, מִצְטָרְפִין אֶחָד מֵעֶשְׂרִים וְאַרְבַּע בְּנוֹפֵל לְבֵית סְאָה. רַבִּי שִׁמְעוֹן אוֹמֵר, כְּשֵׁם שֶׁאָמְרוּ לְהַחְמִיר כָּךְ אָמְרוּ לְהָקֵל, הַפִּשְׁתָּן בַּתְּבוּאָה מִצְטָרֶפֶת אֶחָד מֵעֶשְׂרִים וְאַרְבַּע בְּנוֹפֵל לְבֵית סְאָה:

When were these words said [when does this apply]? [With respect to] grain with [a different species of] grain, legumes with [a different species of] legumes, grain with legumes, and legumes with grain. Rightly they have said [the term signifies a ruling handed down by Moshe from Sinai] that all kinds of garden seeds which are not used as food, combine to make up one twenty-fourth [to be considerd kilayim] of that which falls [is sown] into each beit se'ah [a measure of area, equivalent to that area of land large enough to require a Se'ah of seeds to sow it]. Rabbi Shimon says, just as they said [their ruling to result] in stringency, so too they said [their ruling to result] in leniency. Flax with grain combine to make up one twenty-fourth of that which falls [is sown] into a beit se'ah.