I agree with the scholars who see (in Heb 12:18-24) seven images reflecting Mount Sinai that are then contrasted with seven images reflecting Mount Zion. Here’s how that breaks down.
“For you have not come to
(1) what may be touched,
(2) a blazing fire
(3) and darkness
(4) and gloom
(5) and a tempest
(6) and the sound of a trumpet
(7) and a voice whose words made the hears beg that no further messages be spoken to them” (Heb 12:18-19).
Then a few verses later, “But you have come to
(1) Mount Zion and to the city of the living God, the heavenly Jerusalem,
(2) and to innumerable angels in festal gathering,
(3) and to the assembly of the firstborn who are enrolled in heaven,
(4) and to God, the judge of all,
(5) and to the spirits of the righteous made perfect,
(6) and to Jesus, the mediator of a new covenant,
(7) and to the sprinkled blood that speaks a better word than the blood of Abel” (Heb 12:22-24).
The stark contrast between Mount Sinai and Mount Zion is evident by the author’s use of seven images in both sections.