I have just been preparing something for a group tomorrow based on Hebrews 12:14-29. I see Jesus fulfilling OT here too with the stark comparison of two mountains: Mt Sinai and Mt Zion.
At Sinai (Exodus 19), Israel couldn’t stand on the mountain. They had to camp at the foot and if anyone touched the mountain (human or animal) they had to die. Moses was the mediator between Israel and God, he brought the first covenant to Israel but in his anger at their sin, he smashed the tablets and had to redo them up the mountain again.
At Zion, the future of God’s kingdom, everyone trusting in God’s Grace can ascend the mountain. There is no death for them. Jesus is the mediator and his sprinkled blood covers all else, speaking a better word than the blood of Abel.
I love how Moses, Sinai and the Old Covenant points to Jesus but human sin continued to be the barrier between God who is ‘an all consuming fire’ and the people, whereas Jesus, Zion, and the New Covenant enables all who have trusted the blood of Jesus to enter freely. The Old Testament Sinai is a shadow of what is fulfilled on Zion in future by Jesus.