Why did heaven need to be purified by Christ's blood?

**Hebrews 9:23,** speaking of Moses purifying the earthly tabernacle and Jesus the heavenly home with blood, says, > It was therefore necessary that the patterns of things in the heavens > should be purified with these; but the heavenly things themselves with > better sacrifices than these. I thought the blood cleansed of sin. If so, then why was it applied to heavenly things? Or was the blood applied for a different reason to these two places?