Moses comes down Sinai with the stone tablets with the laws for proper worship at the Tabernacle. The people were fed up waiting and decided to worship whoever and however they like, making a golden calf from the gold God gave to them in Egypt. God is ready to destroy them, but stops at HIs word of promise and grace. Moses completely destroys the calf so not even the remnants can be used again. Worship is about us receiving and reflecting on the grace of God with the intent of sharing the goodness of God with others. Worship cannot be about our whims or desires, otherwise we would just be worshipping ourselves.