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>all he got to do is be able to light a fire.
The kohen (priest) that led the red heifer would exit the Temple Mount to the Mount of Olives along with an entourage of the elders of the Sanhedrin, the Jewish judicial high court. When the group arrived at the mountain, the sages would intentionally render the kohen ritually impure and instruct him to immerse in the mikveh (ritual purity bath) located on site, so that he would be of the status of someone that immersed on that day (Hebrew: tvul yom) when he prepared the red heifer.
A large pile of wood would be prepared in advance at this location. On this large pile, the red heifer was positioned with its head to the south and its face to the west, in the direction of the Sanctuary.
There is an allowance to add to the pile of firewood as much wood as desired, in order to increase the final amount of ashes.
The kohen stands in the east and faces the west. Standing in this position, he slaughters the red heifer with his right hand and collects some of its blood in his left hand. Then the kohen dips his right finger into the blood held in his left hand and sprinkles it in the direction of the entrance to the Sanctuary. He repeats this process seven times.
After the sprinkling process, the kohen wipes the remaining blood from his hands onto the body of the red heifer to ensure that all the remaining blood would burn, along with its body.
The kohen then descends from the pile, ignites the fire, and waits until the fire consumes a majority of the red heifer’s body. The red heifer’s body is to be burnt in its entirety, including its skin, without stripping or dissecting it at all.
Afterwards, the kohen takes cedar wood, hyssop, and wool dyed crimson, binds them together, and throws them into the fire, along with the burning red heifer.
The actions listed above must be done during the day and not at night.
Thus the role of the kohen who burns the red heifer is completed.
https://templeinstitute.org/para-aduma-the-red-heifer/