After the person dies, there is a Mitzva to bury the body. The question is why do we need to bury the body, why can’t we just burn it? It is taught in Devarim 21:23 לֹא ־תָלִ֨ין נִבְלָת֜וֹ עַל ־הָעֵ֗ץ כִּֽי־ קָב֤וֹר תִּקְבְּרֶ֙נּוּ֙ בַּיּ֣וֹם הַה֔וּא כִּֽי־ קִלְלַ֥ת...