אַל־תְּשַׁקְּצוּ֙ אֶת־נַפְשֹׁ֣תֵיכֶ֔ם בְּכָל־הַשֶּׁ֖רֶץ הַשֹּׁרֵ֑ץ וְלֹ֤א תִֽטַּמְּאוּ֙ בָּהֶ֔ם וְנִטְמֵתֶ֖ם בָּֽם׃
Ye shall not make yourselves detestable with any swarming thing that swarmeth, neither shall ye make yourselves unclean with them, that ye should be defiled thereby.
Read kabbalistic (mystical) interpretation of Leviticus 11:43: and classical mystical sources.