Then he is to change his clothes, dressing himself with a different set of clothes, and take the ashes to a clean place outside the camp.
They are also to remove the ashes on the altar and spread a purple cloth over it.
and then he is to eviscerate it and throw the viscera and the feathers to the east side of the altar, where the fatty ashes are located.
The priest is to clothe himself with a linen robe and undergarments. Then he is to take the ashes of the burnt offering on the altar that had been consumed by the fire and set them beside the altar.
Then someone who is unclean is to gather the ashes of the heifer and lay them outside the camp in a clean place. This is to be done for the community of Israel to use for water of purification from sin. Whoever gathers the ashes of the heifer is to wash his clothes and is to remain unclean until the evening. This ordinance is to remain for the benefit of both the Israelis and the resident aliens who live among them."
"Now as for the unclean, they are to take ashes from the burning sin offering, and pour running water on it inside a vessel.
For if the blood of goats and bulls and the ashes of a heifer sprinkled on those who are unclean purifies them physically,
1 Kings 13:3
Later that same day, he gave them a special display of power of what was to come when he said, "Here's proof that the LORD has decreed this: Look! This altar will be split apart and the ashes that are on it will spill out."
1 Kings 13:5
Also, the altar broke apart and the ashes that were on it spilled out from the altar, providing just the proof that the man of God had predicted in his message from the LORD!