אֵ֛לֶּה הַטְּמֵאִ֥ים לָכֶ֖ם בְּכָל־הַשָּׁ֑רֶץ כָּל־הַנֹּגֵ֧עַ בָּהֶ֛ם בְּמֹתָ֖ם יִטְמָ֥א עַד־הָעָֽרֶב׃
These are they which are unclean to you among all that swarm; whosoever doth touch them, when they are dead, shall be unclean until the even.
Read kabbalistic (mystical) interpretation of Leviticus 11:31: and classical mystical sources.