Our God is a consuming fire
Hebrews quotes Moses' warning that God is a consuming fire while calling its readers to worship Him with reverence and awe.
Therefore, since we are receiving an unshakable kingdom, let us be filled with gratitude, and so worship God acceptably with reverence and awe. “For our God is a consuming fire.”
Deuteronomy 4:23-24 warns Israel not to forget the covenant or make an idol because the LORD is a consuming fire and a jealous God; Hebrews 12:28-29 repeats the consuming-fire declaration after calling for grateful, reverent worship.