The people bring too much stuff for building the tabernacle, and have to be stopped.
They make the infrastructure, ark, table, lamp stand, incense altar, sacrificial altar, and basin, out of a lot of gold, silver and bronze.
How this is about Jesus
"I will build My Church..."
He builds it how God wants it (end of 36:1).
It is a precious people (1 Peter 2:4-5).
Sins this reveals
Stinginess in giving to the church.
Being more interested in our own kingdoms and houses, instead of God's (see Haggai 1).