וְאִ֗ישׁ אֲשֶׁ֤ר יִשְׁכַּב֙ אֶת־דֹּ֣דָת֔וֹ עֶרְוַ֥ת דֹּד֖וֹ גִּלָּ֑ה חֶטְאָ֥ם יִשָּׂ֖אוּ עֲרִירִ֥ים יָמֻֽתוּ׃
And if a man shall lie with his uncle’s wife—he hath uncovered his uncle’s nakedness—they shall bear their sin; they shall die childless.
Read kabbalistic (mystical) interpretation of Leviticus 20:20: and classical mystical sources.