daf bit: Horayot 10

We learn at the beginning of the third chapter of this tractate, in the mishna, that if an anointed high priest or a king committed a sin and then relinquished his position, the high priest brings a bull as a sin-offering and the king brings a goat -- these are bigger offerings than would be required of laymen. If they relinquished their positions before committing the sin, however, the outcome is different: the high priest still brings a bull but the king brings the offering of a layman. And if they committed their sins before gaining these positions, they are regarded as laymen for purposes of their sin-offerings, even if when they bring them they have the higher positions. (9b-10a)

The g'mara brings proof-texts to support the different rules for former high priests and former rulers, but I don't understand how they're getting this answer from those sources (Lev 4:3 and Lev 4:22).

Today's daf is 12.