And he shall burn the heifer before his eyes; its skin, its flesh, and its blood, with its dung, he shall burn.
Torah Temimah: Zevachim 93b — We learn that after finishing the sprinkling he wipes his hand on the body of the para, as it is said “and he shall burn the heifer before his eyes, its skin and its flesh and its blood.”
English: We learn that after finishing the sprinkling he wipes his hand on the body of the para, as it is said “and he shall burn the heifer before his eyes, its skin and its flesh and its blood.”
Derivation from the inclusion of the blood in the burning description.
After completing the seven sprinklings, the Kohen wipes the residual blood from his hand onto the body of the para itself before the burning proceeds.