Wilson's Dictionary of Bible Types
Galatians 4:25 (a) This mountain represents the stern realities of the law. GOD appeared there in thunder and fire and thick darkness, for the law demands absolute obedience, or else punishment. It is in contrast with Calvary, where GOD appeared in human form, in tender loving kindness, and in love. The condition of Jerusalem at that time, with its wickedness, sin and the destruction wrought by its enemies was just a plain evidence of the tragedy that follows the broken laws of Sinai. (See Exodus 19:18).
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Watson, Walter. Entry for 'Sinai'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/s/sinai.html. 1957.