Yoma 2:2-3

Yoma 2:2

On one occasion, two kohanim were racing up the altar ramp. One pushed the other, who fell and broke his leg. When the court saw that the system led to dangerous situations, they ruled that the job of clearing the altar would only be distributed by lottery. This was the first of four lotteries in the Temple.

Yoma 2:3

The second lottery was to determine who would slaughter the twice-daily tamid offering, who would sprinkle its blood, who would remove the ashes from the incense altar, who would clear the lamps of the Menorah, and who would bring the limbs to the ramp of the altar. The things brought to the altar were: the head and the right hind leg; the two front legs; the rump and the left hind leg; the chest and the neck; the two flanks; the entrails; the flour; the pieces of cooked dough; the wine. All told, there were 13 jobs distributed by this lottery. Ben Azzai stated in the presence of Rabbi Akiva in the name of Rabbi Yehoshua that the pieces were offered not in size order as described above but from front to back, in the order in which the animal walked.