The verse contrasts 'our altar' with the Old Testament 'tabernacle.' What exactly is this 'altar' Christians possess, and how is it fundamentally different?
The Bible doesn't point to a physical altar in our churches or even the cross as the primary 'altar' in Hebrews 13:10. Instead, 'our altar' is a powerful metaphor representing the entire salvific work of Christ. This includes his sacrifice on the cross, his atonement for our sins, and the access to God that this sacrifice provides.
Think of it as the foundational reality of reconciliation and forgiveness that comes through Jesus. While the cross is where the sacrifice happened, the 'altar' here encompasses the whole benefit and spiritual reality of that sacrifice: approaching God, receiving pardon, and being accepted.
This isn't something to be found within the old system of temple worship. It's a unique, profound spiritual reality available only through Christ.