All of the 10 commandments were part of Gods plan before and after the fall....
Before the fall God expected us to
have no other gods before Him. Not make any graven image, or any likeness of any thing, not bow down thyself to them, nor serve them: for I the LORD thy God am a jealous God. Not take the name of the LORD thy God in vain; Remember the sabbath day, to keep it holy. Honour thy father and thy mother, not kill, not commit adultery, not steal, not bear false witness against thy neighbour, not covet.
God did not change when Adam sinned. The standards didn't change, God didn't change, the rules didn't change, WE CHANGED.
After the fall God still expected us to obey the principles above.