Hebrews 10:3

But in those sacrifices there is a remembrance again made of sins every year - The reference here is to the sacrifices made on the great day of atonement. This occurred once in a year. Of course as often as a sacrifice was offered, it was an acknowledgment of guilt on the part of those for whom it was made. As these sacrifices continued to be offered every year, they who made the offering were reminded of their guilt and their desert of punishment. All the efficacy which could be pretended to belong those sacrifices, was that they made expiation for the past year. Their efficacy did not extend into the future, nor did it embrace any but those who were engaged in offering them. These sacrifices, therefore, could not make the atonement which man needed. They could not make the conscience easy; they could not be regarded as a sufficient expiation for the time to come, so that the sinner at any time could plead an offering which was already made as a ground of pardon, and they could not meet the wants of all people in all lands and at all times. These things are to be found only in that great sacrifice made by the Redeemer on the cross.

10:3 There is a public commemoration of the sins both of the last and of all the preceding years; a clear proof that the guilt thereof is not perfectly purged away.