These laws will never change. The man who sprinkled the water and the ashes on you when you were unclean must also wash his clothes. And whoever touches this water is unclean until evening.
in front of the curtain that separates the holy place from the most holy place, where the sacred chest is kept. Aaron and his sons are responsible for keeping the lamp burning every night in the sacred tent. The Israelites must always obey this command.
The man who collects the ashes must wash his clothes, but will remain unclean until evening. This law must always be obeyed by the people of Israel and the foreigners living among them.
After the ceremony, the priest is to take a bath and wash his clothes. Only then can he go back into the camp, but he remains unclean and unfit for worship until evening.
These rules are merely about such things as eating and drinking and ceremonies for washing ourselves. And rules about physical things will last only until the time comes to change them for something better.