This reading is from the Torah portion read on Yom Kippur. The complete reading for Yom Kippur is Leviticus 16:1-34 and Numbers 29:7-11.
When he goes in to make expiation in the Shrine, nobody else shall be in the Tent of Meeting until he comes out. When he has made expiation for himself and his household, and for the whole congregation of Israel, he shall go out to the altar that is before the Lord and purge it: he shall take some of the blood of the bull and of the goat and apply it to each of the horns of the altar; and the rest of the blood he shall sprinkle on it with his finger seven times. Thus he shall cleanse it of the uncleanness of the Israelites and consecrate it.
When he has finished purging the Shrine, the Tent of Meeting, and the altar, the live goat shall be brought forward. Aaron shall lay both his hands upon the head of the live goat and confess over it all the iniquities and transgressions of the Israelites, whatever their sins, putting them on the head of the goat; and it shall be sent off to the wilderness through a designated man. Thus the goat shall carry on it all their iniquities to an inaccessible region; and the goat shall be set free in the wilderness.