Leviticus 5:3 Kabbalah

א֣וֹ כִ֤י יִגַּע֙ בְּטֻמְאַ֣ת אָדָ֔ם לְכֹל֙ טֻמְאָת֔וֹ אֲשֶׁ֥ר יִטְמָ֖א בָּ֑הּ וְנֶעְלַ֣ם מִמֶּ֔נּוּ וְה֥וּא יָדַ֖ע וְאָשֵֽׁם׃

or if he touch the uncleanness of man, whatsoever his uncleanness be wherewith he is unclean, and it be hid from him; and, when he knoweth of it, be guilty;

Read kabbalistic (mystical) interpretation of Leviticus 5:3: and classical mystical sources.