Tosefta for Kelim 5:10
חֲתָכוֹ חֻלְיוֹת וְנָתַן חֹל בֵּין חֻלְיָא לְחֻלְיָא, רַבִּי אֱלִיעֶזֶר מְטַהֵר, וַחֲכָמִים מְטַמְּאִין. זֶה תַנּוּרוֹ שֶׁל עַכְנָאי. יוֹרוֹת הָעַרְבִיִּין שֶׁהוּא חוֹפֵר בָּאָרֶץ וְטָח בְּטִיט, אִם יָכוֹל הַטִּיחַ לַעֲמוֹד בִּפְנֵי עַצְמוֹ, טָמֵא. וְאִם לָאו, טָהוֹר. וְזֶה תַנּוּרוֹ שֶׁל בֶּן דִּינָאי:
If an oven is cut into rings, and sand is placed between the rings, Rabbi Eliezer says it is pure. But the sages say it is susceptible to impurity. This is the oven of Akhnai. Arabian vats, which are holes dug in the ground and plastered with clay - if the plastering can stand by itself it is susceptible to impurity; otherwise, it is not susceptible. This is the oven of Ben Dinai.
Tosefta Eduyot
Four things Rabbi Eliezer declares pure while the Sages declare impure. The rim of a stone strainer—Rabbi Eliezer says: It is not impure in the air; but the Sages say: It is impure in the air. A baker's sheet which is fixed to a nail, or attached to a beam—Rabbi Eliezer makes it pure; but the Sages make it impure. A shoe that is on the shoe mold—Rabbi Eliezer makes it pure; but the Sages make it impure. He cut it [an oven, see Mishnah Kelim 5:10] into rings, and sand is placed between each ring, Rabbi Eliezer makes it pure; but the Sages make it impure. This was called the oven of Akhnai, for on its account, disagreement (mahloket) increased in Israel.
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