Originally published 3/8/11, 11:03 am.
A Heireish, a Shoteh, and a Qatan may not read Mg'illah for others
Of course the usual p'shat meaning of Heireish is a deafmute, which makes this impossible!
Here are several approaches:
Pick your Parshanut Preference.
1. The Mishnah is using a formula only. A deaf person may read the m'gillah for others - even though he cannot hear it himself. The Mishnah really means to address ONLY shoteh v'qatan and it used Heireish ONLY due to shigrat halashon.
2. Since the deaf-mute case is not possible, the Mishnah must therefore default to the case of a deaf person only, and Heireish does apply. albeit not in its usual sense