Related for Eduyot 3:11
אַף הוּא אָמַר שְׁלֹשָׁה דְבָרִים לְהָקֵל. מְכַבְּדִין בֵּין הַמִּטּוֹת, וּמְנִיחִין אֶת הַמֻּגְמָר בְּיוֹם טוֹב, וְעוֹשִׂים גְּדִי מְקֻלָּס בְּלֵילֵי פְסָחִים. וַחֲכָמִים אוֹסְרִים:
He (R. Gamliel) also stated three leniencies: It is permitted (on Yom Tov) to sweep between the beds [on which they used to recline to eat], and mugmar (frankincense) may be placed [on coals, to be inhaled] on Yom Tov. [But all hold that it is forbidden to do so to "scent" the vessels], and it is permitted to eat a "helmeted" (mekulass) goat on Pesach night. [Its legs and innards hung at its side when they roasted it. They would do this as a remembrance of the Pesach offering, in respect to which it is written (Exodus 12:9): "its head with its legs with its innards." ("mekulas":) like a warrior, whose weapons are at his side. The targum of "a copper helmet" is "kulsa denachsha."] And the sages forbid [all three: sweeping, because of the making of holes; mugmar, because it is not needed by all, but only by the very delicate or those with body odor; a "helmeted" goat, because it gives the impression of consecrated food being eaten outside (the sanctuary). The halachah is in accordance with the sages.]