Who comes first crime or law?

Even though law is made to avoid unconstitutional and unethical actions. It is said that law came first before the crime. Why law came first? It's because you can't identify someone's action as a crime if there is no law punishing that action. To side an instance, Australia allowed abortion and it's not considered as a crime to their country since there is no law punishing it—besides they have a law called Abortion Law that legalize abortion.