לֹ֣א תַקִּ֔פוּ פְּאַ֖ת רֹאשְׁכֶ֑ם וְלֹ֣א תַשְׁחִ֔ית אֵ֖ת פְּאַ֥ת זְקָנֶֽךָ׃
Ye shall not round the corners of your heads, neither shalt thou mar the corners of thy beard.
Read kabbalistic (mystical) interpretation of Leviticus 19:27: and classical mystical sources.