ordain

Definition:

To ordain means to formally appoint a person for a special task or role. It also means to formally make a rule or decree.

The term "ordain" often refers to formally appointing somebody as a priest, minister, or rabbi.
For example, God ordained Aaron and his descendants to be priests.
It can also mean to institute or establish something, such as a religious feast or covenant.
Depending on the context, "to ordain" could be translated as "to assign" or "to appoint" or "to command" or "to make a rule" or "to institute."