וְהֵבִ֤יא אֹתָם֙ אֶל־הַכֹּהֵ֔ן וְהִקְרִ֛יב אֶת־אֲשֶׁ֥ר לַחַטָּ֖את רִאשׁוֹנָ֑ה וּמָלַ֧ק אֶת־רֹאשׁ֛וֹ מִמּ֥וּל עָרְפּ֖וֹ וְלֹ֥א יַבְדִּֽיל׃
And he shall bring them unto the priest, who shall offer that which is for the sin-offering first, and pinch off its head close by its neck, but shall not divide it asunder.
Read kabbalistic (mystical) interpretation of Leviticus 5:8: and classical mystical sources.