Mishnah for Kelim 17:8
כַּזַּיִת שֶׁאָמְרוּ, לֹא גָדוֹל וְלֹא קָטָן אֶלָּא בֵינוֹנִי, זֶה אֵגוֹרִי. כַּשְּׂעֹרָה שֶׁאָמְרוּ, לֹא גְדוֹלָה וְלֹא קְטַנָּה אֶלָּא בֵינוֹנִית, זוֹ מִדְבָּרִית. כָּעֲדָשָׁה שֶׁאָמְרוּ, לֹא גְדוֹלָה וְלֹא קְטַנָּה אֶלָּא בֵינוֹנִית, זוֹ מִצְרִית. כָּל הַמִּטַּלְטְלִין מְבִיאִין אֶת הַטֻּמְאָה בָּעֳבִי הַמַּרְדֵּעַ, לֹא גָדוֹל וְלֹא קָטָן אֶלָּא בֵינוֹנִי. אֵיזֶה הוּא בֵינוֹנִי, כֹּל שֶׁהֶקֵּפוֹ טָפַח:
[The measurement of] the olive that was mentioned is neither large and not small, but medium-sized; this is the <em>egori</em> [olive]. The barley-grain that was mentioned is not large and not small, but medium-sized; this is <em>midbarit</em> [barley]. The lentil that was mentioned is neither large nor small, but medium-sized; this is the Egyptian [lentil]. All movable goods impart impurity [by forming a "tent" over a dead body and other items] if they are the thickness of a shepherd's staff - neither large nor small, but average. What is average? Any which has a circumference of a <em>tefach</em>.