Exodus 25:1-chapt. 27:19
1 Kings 5:12-chapt. 6:13
My thoughts on Hebrews chapter 8:
It’s not so much saying that the Covenant is fading away as much as what all the old Covenant had involved in it, i/e annual blood sacrifices, the Tent of Meeting and the Temple.
There is only one sacrifice needed now, the death of the Messiah for the sins of the world, and our hearts prepared as a temple for Yahweh.
If you read chapters 7 & 9 along with chapter 8 of Hebrews, I think it explains this quite thoroughly. It lays it out to where almost anyone can understand it.