וְעַ֛ל כָּל־נַפְשֹׁ֥ת מֵ֖ת לֹ֣א יָבֹ֑א לְאָבִ֥יו וּלְאִמּ֖וֹ לֹ֥א יִטַּמָּֽא׃
neither shall he go in to any dead body, nor defile himself for his father, or for his mother;
Read kabbalistic (mystical) interpretation of Leviticus 21:11: and classical mystical sources.