The heavenly things themselves were purified with better SACRIFICES

[tonychanyt]

Hebrews 9:

22 Indeed, under the law almost everything is purified with blood, and without the shedding of blood there is no forgiveness of sins.
23 Thus it was necessary for the copies of the heavenly things to be purified with these rites,

plurals

but the heavenly things themselves with better sacrifices than these.

Why plural sacrifices since Christ's perfect sacrifice is singular?

Benson explained:

Namely, by the one sacrifice of Christ, expressed in the plural number, because it included the signification of all other sacrifices, exceeded them indignity, and was of more use and efficacy than they all.

Jamieson-Fausset-Brown:

The plural is used in expressing the general proposition, though strictly referring to the one sacrifice of Christ once for all. Paul implies that His one sacrifice, by its matchless excellency, is equivalent to the Levitical many sacrifices. It, though but one, is manifold in its effects and applicability to many.

Bengel:

The plural, corresponding to the Levitical plural, is used for the singular, on account of the excellence of the one sacrifice of Christ, which was perfect in all its parts. If a Jew asks, What are your sacrifices? We answer: Our sacrifices consist in the one matchless sacrifice of Him who was crucified.

Cambridge Bible for Schools and Colleges:

The plural is here only used generically to express a class. He is alluding to the one transcendent sacrifice.

This interpretation is confirmed in the later context:

26b But as it is, he has appeared once for all at the end of the ages to put away sin by the sacrifice of himself. 27And just as it is appointed for man to die once, and after that comes judgment, 28so Christ, having been offered once to bear the sins of many, will appear a second time, not to deal with sin but to save those who are eagerly waiting for him.