The placement in Torah of the Parah Adumah in our Parsha Chukat raises questions as to why it and it’s Halachot are mentioned here in our Parsha; only after Korach’s rebellion and after the continued murmuring of the Am against Moshe Rabbeinu, after the plague which killed thousands only ending with Aaron’s carrying an incense pan amongst the people (upon Moshe’s instruction), and after the story of the rods.
“Rabbi Artscroll” presents one answer to the question of placement in a commentary in The Stone Chumash on the words at the beginning of our Parsha “…el Moshe, v’el Aaron” [1] The answer speaks of the symbolism of the Parah Adumah (the Red Heiffer) coming to atone for the sin of the Eigel Zahav (the Golden Calf) “… as if to say let the Mother come and clean up the mess left by her child…”