Numbers 23:5, 8, 11

Then the LORD put a message in Balaam’s mouth and said, “Return to Balak, and speak what I tell you.”

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

Then Balak said to Balaam, “What have you done to me? I brought you to curse my enemies, but on the contrary you have only blessed them!”