And they shall take for the unclean person of the ashes of the burning of the purification offering, and put living water upon them in a vessel.
Torah Temimah: Yoma 43a — All are fit to sanctify except a deaf-mute, an imbecile and a minor, for the verse says “and they shall take for the unclean… of the ashes of the burning of the chatas”; those who are disqualified for you in the gathering are disqualified in the sanctification, and those who are fit for you in the gathering are fit for you in the sanctification.
English: All are fit to sanctify except a deaf-mute, an imbecile and a minor… those who are disqualified for you in the gathering are disqualified in the sanctification, and those who are fit for you in the gathering are fit for you in the sanctification.
Comparison of the fitness requirements for gathering and for sanctifying.
The same categories of people who are unfit to gather the ashes are unfit to place the ashes into the water (sanctify the mei chatas).