The answer is: Moses and Elijah

Mark 9:4

In the dramatic scene of the Transfiguration, Jesus embraces a moment of divine revelation, appearing to his three closest disciples: Peter, James, and John. This event is packed with rich symbolism and connections to Jewish tradition. Moses, the great lawgiver, and Elijah, the fierce prophet, symbolize the Law and the Prophets, anchoring Jesus deeply within the Hebrew narrative.

Did you know that Moses experienced a transfiguration of sorts himself? After receiving the Ten Commandments, Moses’ face glowed radiantly after spending time in God’s presence (Exodus 34:29-30). Just as his face shone and required a veil, here, the glory of Jesus became visible, illuminating the transition from ancient Judaism to the new path Jesus embodied.

Elijah's presence adds yet another layer. He is prophesied to return before the "great and terrible day of the Lord" (Malachi 4:5). For early Christians, having Elijah appear with Jesus hinted at Jesus as the fulfillment of this prophecy, signaling a mighty change in spiritual understanding.

Interestingly, the voice that addresses the disciples during the Transfiguration—a divine affirmation of Jesus as God's chosen one—mirrors the voice they heard at Jesus' baptism. This consistency emphasizes continuity for followers, affirming Jesus as an evolution of God’s spiritual mission through history. This remarkable event invites reflection—not on an exclusive narrative but on the inclusive quest of discovering divine truth across time!