וְאֶת־בְּשַׂ֤ר הַפָּר֙ וְאֶת־עֹר֣וֹ וְאֶת־פִּרְשׁ֔וֹ תִּשְׂרֹ֣ף בָּאֵ֔שׁ מִח֖וּץ לַֽמַּחֲנֶ֑ה חַטָּ֖את הֽוּא׃
But the flesh of the bullock, and its skin, and its dung, shalt thou burn with fire without the camp; it is a sin-offering.
Read kabbalistic (mystical) interpretation of Exodus 29:14: and classical mystical sources.