'Cursed' in the Bible

Please come and put a curse on these people for me because they are more powerful than I am. I may be able to defeat them and drive them out of the land, for I know that those you bless are blessed and those you curse are cursed.”

How can I curse someone God has not cursed?How can I denounce someone the Lord has not denounced?

He crouches, he lies down like a lionor a lioness—who dares to rouse him?Those who bless you will be blessed,and those who curse you will be cursed.