God calls Moses back up Mt Sinai. God shows Himself, gives another copy of the law, and summarizes the covenant again. Moses goes down and his face is shining.
Moses calls for offerings for making the tabernacle, and the people bring precious metals and fabric.
How this is about Jesus
Jesus is transfigured with His face shining on the mountain, too.
Jesus is the cornerstone of the temple that we are, being built for God.
Sins this reveals
We build idols with our stuff and our energy, when our hearts turn from God.
We often withhold from God what He asks of us, out of selfishness.