How do we know the Old Covenant is no longer valid?

Hebrews makes it clear that the Old Covenant was only a type and shadow of the things to come and has now been fulfilled in Christ's work. The sacrificial system and the physical tabernacle served a purpose for a time, but with the coming of Jesus, the need for these was abolished. Hebrews 8 emphasizes that Christ is a high priest of a better covenant, indicating that the Old Covenant is no longer in action. It is crucial for believers to understand that our relationship with God is established through the New Covenant in Christ alone.