The answer is: Moses and Elijah

Mark 9:4

In Mark 9:4, we witness a truly remarkable moment—Jesus transfigured before Peter, James, and John, flanked by Moses and Elijah. This scene resonates powerfully with the deep roots of Jewish tradition. Moses represents the Law, the giver of the Ten Commandments, and Elijah, the formidable prophet, signifies the voice of the prophets demanding justice and faithfulness. Together, they symbolize the entirety of the Hebrew Scriptures, underlining that Jesus stands at the center of God's unfolding plan.

Did you know that both Moses and Elijah experienced encounters with God on mountains—they too had their transformative moments? Moses received the Law on Mount Sinai, where his face shone from being in God's presence (Exodus 34:29-35). Similarly, Elijah met God on Mount Horeb after fleeing from despair, demonstrating the prophet's deep yearning for divine connection (1 Kings 19:11-13).

The significance of this collaboration at the transfiguration goes beyond the mere presence of these two historical figures; it underscores the unification of God’s work across different eras. The voice from the cloud, declaring Jesus as "my Son, whom I love," elevates him above even these towering figures, dichotomizing the Old and New Testaments.

This scenario invites believers to marvel at the continuity in the relationship between God and humanity. It acts as a divine confirmation for the disciples and, by extension, all who seek understanding of the interconnected story within both the Torah and the teachings of Jesus. Such layers deepen our appreciation of these texts as a continuous journey from one testament to another, much like the messages carried by Moses and Elijah themselves!