ציטירנדיקער פּירוש אויף ויקרא 4:18

וכפר אהרן על קרנותיו אחת בשנה, “and Aaron is to perform atonement rites once a year on its horns (corners); this does not mean that no blood is to be sprinkled on the horns of this altar except once a year; after all the Torah wrote (Leviticus 4,7) that if the High priest has committed an inadvertent sin that he must atone for this by means of the blood of a bull, by sprinkling some of it on the horns of this altar, and the same procedure is also decreed to be performed in another instance mentioned in Leviticus 4,18,; but in our verse the Torah refers to the Day of Atonement when the High Priest performs all the rites pertaining to atonement for the entire nation, after having first made sure that his own sins and those of his family had been atoned for. This ritual had to be performed every year on the same day, whereas the other two rituals we cited may not have been called for many years.