Numbers 19:7

“Moreover, whoever goes into the house during the time that he has put it under isolation becomes unclean until evening.

‘And the one who gathers the ashes of the heifer shall wash his clothes and be unclean until evening; and it shall be a perpetual statute to the sons of Israel and to the sojourner who sojourns among them.

‘So it shall be a perpetual statute for them. And he who sprinkles the water for impurity shall wash his clothes, and he who touches the water for impurity shall be unclean until evening.

For the bodies of those animals whose blood is brought into the holy places by the high priest as an offering for sin, are burned outside the camp.