According to Moses, this verse talks about special things made for God's house, like a big table called an altar and a bowl for washing, all made from shiny metal called brass. These things were important for people to show their love and respect for God.
Exodus 39:39: The brasen altar, and his grate of brass, his staves, and all his vessels, the laver and his foot,
It explains the inefficacy of animal sacrifices for taking away sins, whereas Exodus 39:39 describes detailed preparation of physical aspects of the tabernacle where such sacrifices were conducted.
Hebrews 10:4: For [it is] not possible that the blood of bulls and of goats should take away sins.