decree

Definition:

A decree is a proclamation or law that is publicly declared to all the people.

God's laws are also called decrees, statutes, or commandments.
Like laws and commands, decrees must be obeyed.
An example of a decree by a human ruler was the proclamation by Caesar Augustus that everyone living in the Roman Empire must go back to their hometown in order to be counted in a census.
To decree something means to give an order that must be obeyed. This could be translated as "to order" or "to command" or "to formally require" or "to publicly make a law."
Something that is "decreed" to happen means that this "will definitely happen" or "has been decided upon and will not be changed" or "declared absolutely that this will happen."