What is the 'better thing' mentioned in Hebrews 11?

In Hebrews 11:40, the 'better thing' denotes the complete fulfillment of God's promises that the Old Testament believers anticipated but did not receive in their lifetime. This fulfillment is found in the person and work of Jesus Christ, who established a new and everlasting covenant through His death and resurrection. Unlike the shadows of the Old Covenant, this better thing reveals the fullness of grace and truth. The believers in the Old Testament trusted in the coming Messiah, while we celebrate the reality of the promise already fulfilled. Thus, this better thing highlights the transition from the anticipation of the coming of Christ to the certainty of salvation obtained through His grace. It illustrates the assurance that believers now possess in Christ's finished work.