"And the sons of Aaron shall arrange" (Leviticus 1:8) - one might think even a hundred. Scripture teaches, saying "and the priest shall arrange." One might think a single priest arranges all the limbs. Scripture teaches, saying "and they shall arrange." How so? One priest arranges two limbs. And how many limbs are there? Ten, and one with the innards. It turns out that the lamb is offered up by six priests, the words of Rabbi Yishmael. Rabbi Akiva says: "and they shall arrange" - two; "the sons of Aaron" - two; "the priests" - two; from here that the lamb is offered up by six.
How Many Priests Arrange the Lamb Upon the Altar
Yalkut Shimoni on Torah 444:3
וְעָרְכוּ בְּנֵי אַהֲרֹן יָכוֹל אֲפִלּוּ מֵאָה תַּלְמוּד לוֹמַר וְעָרַךְ הַכֹּהֵן יָכוֹל יְהֵא כֹּהֵן אֶחָד עוֹרֵךְ כָּל הָאֵיבָרִים, תַּלְמוּד לוֹמַר "וְעָרְכוּ" הָא כֵּיצַד כֹּהֵן אֶחָד עוֹרֵךְ שְׁנֵי אֵיבָרִים וְכַמָּה הֵן אֵיבָרִים, עֲשָׂרָה וְאֶחָד בַּקְּרָבַיִם, נִמְצָא [שֶׁהַטָּלֶה] עוֹלֶה בְּשִׁשָּׁה דִּבְרֵי רַבִּי יִשְׁמָעֵאל, רַבִּי עֲקִיבָא אוֹמֵר וְעָרְכוּ, שְׁנַיִם בְּנֵי אַהֲרֹן, שְׁנַיִם הַכֹּהֲנִים, שְׁנַיִם מִכָּאן (שֶׁהָעוֹלָה) [שֶׁהַטָּלֶה] עוֹלֶה בְּשִׁשָּׁה.