How do we know that Job's witness is in heaven?

Job boldly asserts, 'Behold, my witness is in heaven' (Job 16:19), as he defends his integrity against the accusations of his friends. Job's faith in God's sovereignty allows him to find assurance in a heavenly witness who knows his heart and sincerity. In expressing that his 'record is on high,' Job acknowledges the ultimate authority of God and the need for a mediator, foreshadowing the role of Christ as our advocate—the one who pleads our case before the Father. This assurance provides strength for Job amidst his trials, knowing that true justice rests with God.