Numbers 22:6
So please come now and put a curse on these people, because they are too mighty for me. Perhaps 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."

Numbers 22:12
But God said to Balaam, "Do not go with them. You are not to curse this people, for they are blessed."

Numbers 23:7
And Balaam lifted up an oracle, saying: "Balak brought me from Aram, the king of Moab from the mountains of the east. 'Come,' he said, 'put a curse on Jacob for me; come, denounce Israel!'

Proverbs 26:2
Like a fluttering sparrow or darting swallow, an undeserved curse does not come to rest.