"and the whole mountain trembled": (Mount Sinai) was included in all of the mountains, viz. (Judges 5:5) "The mountains quaked before the L–rd — This is Sinai, etc." and (Psalms 68:17) "Why do you quake, you mountains gavnunim"? ("givnonim" = "peaked"), as in (Leviticus 21:20) "or a hunchback ('gibein') or a dwarf." He said to them: You are all givnonim (in spite of which He chose [the 'lowly'] Sinai).