Two mountains are written about here in Hebrews 12.
Mt. Sinai- the Law
Mt. Zion- the Cross
18 For you have not come to what may be touched, a blazing fire and darkness and gloom and a tempest 19 and the sound of a trumpet and a voice whose words made the hearers beg that no further messages be spoken to them. 20 For they could not endure the order that was given, “If even a beast touches the mountain, it shall be stoned.” 21 Indeed, so terrifying was the sight that Moses said, “I tremble with fear.” —Hebrews 12:18-21
22 But you have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, and to innumerable angels in festal gathering, 23 and to the assembly of the firstborn who are enrolled in heaven, and to God, the judge of all, and to the spirits of the righteous made perfect, 24 and to Jesus, the mediator of a new covenant, and to the sprinkled blood that speaks a better word than the blood of Abel. —Hebrews 12:22-24
Zion: City of God
Sinai: wilderness
Zion: Connected to heaven
Sinai: Connected to Egypt
Romans 3:23 for all have sinned and fall short of the glory of God, 24 being justified freely by His grace through the redemption that is in Christ Jesus, 25 whom God set forth as a propitiation by His blood, through faith, to demonstrate His righteousness, because in His forbearance God had passed over the sins that were previously committed, 26 to demonstrate at the present time His righteousness, that He might be
and the of the one who has faith in Jesus. —Romans 3:23-26
There are wonderful lessons for us to learn at Mt. Sinai but God does NOT WANT YOU TO LIVE THERE!
25 See that you do not refuse him who is speaking. For if they did not escape when they refused him who warned them on earth, much less will we escape if we reject him who warns from heaven. 26 At that time his voice shook the earth, but now he has promised, “Yet once more I will shake not only the earth but also the heavens.” —Hebrews 12:25-26
27 This phrase, “Yet once more,” indicates the removal of things that are shaken—that is, things that have been made—in order that the things that cannot be shaken may remain. —Hebrews 12:27
28 Therefore let us be grateful for receiving a kingdom that cannot be shaken, and thus let us offer to God acceptable worship, with reverence and awe, 29 for our God is a consuming fire. —Hebrews 12:28-29