Rashi on Leviticus 16:18/רש"י על ויקרא ט״ז:י״ח

1אל המזבח אשר ‎'לפני ה‎‎‎ [AND HE SHALL GO OUT] UNTO THE ALTAR THAT IS BEFORE THE LORD — i. e. unto the golden altar which is before the Lord viz., in the היכל. But why then (if the golden altar is intended) does Scripture state ויצא, “he shall go out" since he did not then leave the area where he officiated before? But because immediately before he made the sprinklings in front of the Partition Vail (cf. Rashi on the preceding verse) and was standing inwards (i.e. westwards) from the altar when sprinkling, whilst for the purpose of sprinkling the blood upon the horns of the altar Scripture forced him to go outwards from the altar (i. e. to its east-side, the side facing the exit) so that he should begin the sprinklings from the north-east corner, therefore it rightly Uses the term ויצא, he shall go out" i. e. move alongside the altar towards the exit (Sifra, Acharei Mot, Chapter 4 7-8; Yoma 58b).

2וכפר עליו AND HE SHALL MAKE EXPIATION FOR IT — wherein does this expiation consist? ולקח מדם הפר ומדם השעיר that HE TAKETH OF THE BLOOD OF THE BULLOCK AND OF THE BLOOD OF THE GOAT mingled one with the other and sprinkles it (Sifra, Acharei Mot, Chapter 4 9; Yoma 57b).