וְהַשָּׂעִ֗יר אֲשֶׁר֩ עָלָ֨ה עָלָ֤יו הַגּוֹרָל֙ לַעֲזָאזֵ֔ל יָֽעֳמַד־חַ֛י לִפְנֵ֥י יְהוָ֖ה לְכַפֵּ֣ר עָלָ֑יו לְשַׁלַּ֥ח אֹת֛וֹ לַעֲזָאזֵ֖ל הַמִּדְבָּֽרָה׃
But the goat, on which the lot fell for Azazel, shall be set alive before the LORD, to make atonement over him, to send him away for Azazel into the wilderness.
Read kabbalistic (mystical) interpretation of Leviticus 16:10: and classical mystical sources.