How do we know that Moses appeared on the Mount of Transfiguration?

The appearance of Moses on the Mount of Transfiguration, along with Elijah, is documented in three Gospel accounts (Matthew 17, Mark 9, Luke 9). While some might speculate about the nature of this event, the clear presence of Christ, Moses, and Elijah indicates a literal appearance rather than a vision. This moment not only affirms the resurrection and existence of biblical figures after death but also emphasizes the fulfillment of the law and the prophets in Jesus Christ. It clarifies that while Moses represents the law, Christ embodies its completion and the glory that surpasses it.