משנה אויף ויקרא 4:3

Rabbi Yose the Galilean said: bulls must be no more than two years old, for it is said, "And the second bull you shall take for a sin-offering" (Numbers 8:8). But the sages say: they may be even three years old. Rabbi Meir says: even those that are four or five years old are valid, but old animals are not brought out of respect.

An [anointed high priest] who rendered an errant decision alone and acted accordingly alone, he makes his atonement alone. If he rendered his ruling together with [the court of] the congregation and acted accordingly together with the congregation, he makes his atonement together with the congregation. For the court is not liable unless they ruled to annul part of a commandment and to retain a part of it; and so [it is with] the anointed [high] priest. Nor [are they liable] for idolatry unless they ruled to annul the law in part and to retain it in part.

The whole day is a valid time for reading the Megillah; reciting Hallel; for the blowing of the shofar; for taking up the lulav; for the Musaf prayer; for Musaf sacrifices; for confession over the oxen; for the confession over the tithe; for the confession of sins on Yom HaKippurim; for laying on of hands; for slaughtering [the sacrifices]; for waving [them]; for bringing near [the vessel with the minhah-offering to the altar]; for taking a handful; for placing it on the fire; for pinching off [the head of a bird-offering]; for receiving the blood [in a vessel]; for sprinkling [the blood on the altar]; for making the sotah drink [the bitter waters]; for breaking the neck of the heifer; and for purifying the metzora.