How do we know Christ is the only acceptable offering?

In Hebrews 9:14, it's stated that Christ offered Himself without spot to God, securing eternal redemption for His people. The sacrifices under the Old Covenant of bulls and goats were insufficient, because they could not truly satisfy divine justice. Only Christ, being holy and undefiled, could bear the sins of others in such a manner that His offering was fully pleasing to God. Furthermore, Malachi speaks to the flaws of humanity's offerings, showing how our attempts fall short and can pollute the altar. Only by relying on Christ’s perfect sacrifice can we find clear consciences and experience true redemption, for He is the personal mediator and reward for believers.