The flame of fire is a biblical symbol of God’s holiness and of the intense, consuming operation of His holiness against sin.
Definition
The flame of fire is a biblical image of intense, consuming holiness.
Biblical Usage
It symbolizes God’s holiness and the operation of that holiness against sin.
Historical Bible Dictionaries
Easton's Bible Dictionary
Is the chosen symbol of the holiness of God (Ex. 3:2; Rev. 2:18), as indicating “the intense, all-consuming operation of his holiness in relation to sin.”