Reference for Moed Katan 27:1

ומנודה שהתירו לו חכמים וכן מי שנשאל לחכם והותר

OR ONE UNDER A BAN TO WHOM THE SAGES HAVE [JUST] GRANTED ABSOLUTION. AND LIKEWISE ONE WHO APPLIED TO A SAGE AND WAS ABSOLVED [BY HIM]. HAND-TOWELS, BARBERS' TOWELS AND BATH-TOWELS [MAY BE WASHED].

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