What does the Bible say about eternal inheritance?

Eternal inheritance is central to the message of Hebrews 9:15-22, where it is revealed that Jesus, as the mediator of the New Testament, has secured for His people the promise of eternal life through His death. Just as a last will is executed only upon the death of the testator, the benefits of the New Covenant are realized only because Christ died, ensuring that His promises are fulfilled for those He has chosen. This inheritance is described as incorruptible, undefiled, and reserved in heaven for the elect, emphasizing its everlasting nature and divine guarantee.