'Cursed' in the Bible

So now, please come and curse this nation for me, for they are too powerful for me. Perhaps I will prevail so that we may conquer them and drive them out of the land. For I know that whoever you bless is blessed, and whoever you curse is cursed."

How can I curse one whom God has not cursed, or how can I denounce one whom the Lord has not denounced?

They crouch and lie down like a lion, and as a lioness, who can stir him? Blessed is the one who blesses you, and cursed is the one who curses you!'"