Exodus 30:10
10 sAaron shall make atonement on its horns once a year. With the blood of the tsin offering of atonement he shall make atonement for it once in the year throughout your generations. It is most holy to the Lord.”
Hebrews 9:7
7 but into the second only athe high priest goes, and he but aonce a year, and not without taking blood, bwhich he offers for himself and for the unintentional sins of the people.
Hebrews 9:25
25 Nor was it to offer himself repeatedly, as jthe high priest enters kthe holy places every year with blood not his own,