Numbers 23:7-8, 11-12

Then Balaam uttered his oracle, saying, “Balak, the king of Moab, brought me from Aram, out of the mountains of the east, saying, ‘Come, pronounce a curse on Jacob for me; come, denounce Israel.’ 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!” Balaam replied, “Must I not be careful to speak what the LORD has put in my mouth?”