Edyos3: 5
הַקֶּלַע שֶׁבֵּית קִבּוּל שֶׁלָּהּ אָרוּג, טְמֵאָה. וְשֶׁל עוֹר, רַבִּי דוֹסָא בֶן הָרְכִּינָס מְטַהֵר, וַחֲכָמִים מְטַמְּאִין. נִפְסַק בֵּית אֶצְבַּע שֶׁלָּהּ, טְהוֹרָה. בֵּית הַפָּקִיעַ שֶׁלָּהּ, טְמֵאָה.
A sling whose holder is [made of] woven [cloth] is [capable of becoming] tamei. But [if the holder is made] of leather, R' Dosa ben Horkinas rules it tahor, but the Sages rule it tamei. [If] its fingerhold splits, it is tahor. [But if] the part of the cord that the user holds [breaks, the sling retains its ability to become] tamei.