And a pure man shall gather the ashes of the heifer and place them outside the camp in a pure place; and it shall be for the congregation of the children of Yisrael for a keeping, for water of sprinkling; it is a chatas.
Torah Temimah: Sifrei — From here they said: they divide it into three portions — one they place in the cheil, one on the Mount of Olives, and one is divided among all the mishmaros.
English: From here they said: they divide it into three portions — one they place in the cheil, one on the Mount of Olives, and one is divided among all the mishmaros.
Practical division derived from the requirement of long-term keeping.
The ashes of the para are divided into three parts for safekeeping and distribution: one portion in the Temple complex (cheil), one on the Mount of Olives, and one distributed among the priestly watches.