The answer is: In a burning bush

Exo 3:2

The story of Moses and the burning bush is filled with symbolism and profound significance. Imagine this: Moses, a shepherd in the desert, stumbles upon a bush that is on fire but isn’t consumed by the flames. This striking image is not just a miracle—it's an embodiment of divine presence! It showcases how something ordinary can transform into a vessel for a monumental revelation.

Historically, setting aside specific details, many cultures regarded flames as a connection to the divine. In the Hebrew scriptures, fire often brings forth God's presence and power. This isn’t the first time a form of burning fire sparks a holy moment—think of that pillar of fire leading the Israelites through the wilderness or the perpetual flame in the Holy Temple which served as a reminder of God’s unending presence.

When the angel of the Lord appears here, it represents God's first call to Moses, setting the stage for his eventual role as the deliverer of the Israelites from Egypt. This drawn-out feud between Moses and God, filled with doubts and questions (like "Who am I?" and "What if they don't believe me?"), adds human touch in a divine calling.

Interesting tidbit: ever notice how many stories of significant revelation involve a bush or a tree? The Tree of Knowledge from Genesis shows that nature can profoundly represent understanding, much like Moses’ encounter that begins the quest for liberation!