Leviticus – Prohibition of Kilayim
Leviticus 19:19
The Torah states 'You shall not sow your field with two kinds of seed' (כִּלְאַיִם), establishing the foundational biblical prohibition against planting mixed species together.
אֶֽת־חֻקֹּתַי֮ תִּשְׁמֹ֒רוּ֒ בְּהֶמְתְּךָ֙ לֹא־תַרְבִּ֣יעַ כִּלְאַ֔יִם שָׂדְךָ֖ לֹא־תִזְרַ֣ע כִּלְאָ֑יִם וּבֶ֤גֶד כִּלְאַ֙יִם֙ שַֽׁעַטְנֵ֔ז לֹ֥א יַעֲלֶ֖ה עָלֶֽיךָ׃
You shall observe My laws. You shall not let your cattle mate with a different kind; you shall not sow your field with two kinds of seed; you shall not put on cloth from a mixture of two kinds of material.