Reference for Oholot 2:4

הַגּוֹלֵל וְהַדּוֹפֵק מְטַמְּאִין בְּמַגָּע וּבְאֹהֶל, וְאֵינָן מְטַמְּאִין בְּמַשָּׂא. רַבִּי אֱלִיעֶזֶר אוֹמֵר, מְטַמְּאִין בְּמַשָּׂא. רַבִּי יְהוֹשֻׁעַ אוֹמֵר, אִם יֵשׁ תַּחְתֵּיהֶן עֲפַר קְבָרוֹת, מְטַמְּאִין בְּמַשָּׂא. וְאִם לָאו, אֵינָן מְטַמְּאִין בְּמַשָּׂא. אֵיזֶהוּ הַדּוֹפֵק, אֶת שֶׁהַגּוֹלֵל נִשְׁעָן עָלָיו. אֲבָל דּוֹפֵק דּוֹפְקִין, טָהוֹר:

The covering stone and the supporting stone of a grave impurify through touching and through overshadowing, but not through carrying. Rabbi Eliezer says, they do impurify through carrying. Rabbi Yehoshua says, if there is grave-dust under them, they impurify through carriage, but if not, they do not impurify through carrying. What is the supporting stone? It is that upon which the covering stone is buttressed. The stone that buttresses the supporting stone, however, is pure.

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