You are not to do any kind of work on that day, because it is Yom Kippur, to make atonement for you before Adonai your God. There is a difference between sin and iniquity .
Sin is actions, iniquity is imperfections kept inside.
One goat died a painless, sacrificial death for sins. The other died a long, painful death for iniquity. Notice Isaiah 53 has Yeshua also atoning for both. The first involves a miracle that was associated with Yom Kippur. A scarlet cord was tied to the wilderness goat s horns, then a piece was cut off and tied to the temple door.