Book 11: Jachin and Boaz, the two pillars! Two witnesses.
I suspect that the twin pillars in the entrance of the sanctuary influenced the architecture of many churches' facades.
House of God and Giving of the Law) The two witnesses motif is also prominent: two cherubim, for example. Moses is the great name in Book 2, Elijah is the great name in Book 11 and they in turn represent the Law and the Prophets - two witnesses!
The golden calf in Book 2 was a violation of the Second Commandment, and the Israelites fall into the same golden calf sin in Book 11 when they establish two cities where the calf is worshipped.