(7) Aaron shall take the two he-goats and let them stand before God at the entrance of the Tent of Meeting; (8) and he shall place lots upon the two goats, one marked for God and the other marked for Azazel. (9) Aaron shall bring forward the goat designated by lot for God, which he is to offer as a sin offering; (10) while the goat designated by lot for Azazel shall be left standing alive before God, to make expiation with it and to send it off to the wilderness for Azazel...(20) When he has finished purging the Shrine, the Tent of Meeting, and the altar, the live goat shall be brought forward. (21) 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 agent. (22) Thus the goat shall carry on it all their iniquities to an inaccessible region; and the goat shall be set free in the wilderness...(26) The one who set the Azazel-goat free shall wash those clothes and bathe the body in water—and after that may reenter the camp...(29) And this shall be to you a law for all time: In the seventh month, on the tenth day of the month, you shall practice self-denial; and you shall do no manner of work, neither the citizen nor the alien who resides among you. (30) For on this day atonement shall be made for you to purify you of all your sins; you shall be pure before God...(34) This shall be to you a law for all time: to make atonement for the Israelites for all their sins once a year. And Moses did as God had commanded him.
Avodah Service - The High Priest's Confession in the Holy of Holies
(from the Yom Kippur prayer book)
And this was the High Priest's confession: I beg of You, Hashem; they have sinned, acted wickedly, rebelled against You— Your people, the House of Israel— I beg of You, God, atone the sins, iniquities, and rebellions that were committed against You, by Your people, the House of Israel. As it is written in the Torah of Moshe, Your servant, from the mouth of Your glory: “For on this day God will make atonement for you, to cleanse you, from all your sins before God.”
And the priests and the people who were standing in the Temple Courtyard; when they heard the glorious and awesome Name [of God] explicitly pronounced from the mouth of the High Priest, with holiness and with purity, they bowed, prostrated themselves, offered thanks, and fell upon their faces, and said: “Blessed [is God's] Name, God's glorious kingdom is forever and ever.”
And the High Priest prolonged the intoning of the Divine Name until the worshippers completed the response; and completing the verse said to them: “You will be cleansed.” And [now] with Your great goodness, arouse Your mercy, and pardon the community of Israel.