וְהִבְדַּלְתֶּ֞ם בֵּֽין־הַבְּהֵמָ֤ה הַטְּהֹרָה֙ לַטְּמֵאָ֔ה וּבֵין־הָע֥וֹף הַטָּמֵ֖א לַטָּהֹ֑ר וְלֹֽא־תְשַׁקְּצ֨וּ אֶת־נַפְשֹֽׁתֵיכֶ֜ם בַּבְּהֵמָ֣ה וּבָע֗וֹף וּבְכֹל֙ אֲשֶׁ֣ר תִּרְמֹ֣שׂ הָֽאֲדָמָ֔ה אֲשֶׁר־הִבְדַּ֥לְתִּי לָכֶ֖ם לְטַמֵּֽא׃
Ye shall therefore separate between the clean beast and the unclean, and between the unclean fowl and the clean; and ye shall not make your souls detestable by beast, or by fowl, or by any thing wherewith the ground teemeth, which I have set apart for you to hold unclean.
Read kabbalistic (mystical) interpretation of Leviticus 20:25: and classical mystical sources.