Numbers 23:7-8, 11-12

And he took up his parable, and said, Balak the king of Moab hath brought me from Aram, Out of the mountains of the east, Saying, Come, curse me Jacob, And come, defy Israel. How shall I curse, whom God hath not cursed? Or how shall I defy, whom the LORD hath not defied?

And Balak said unto Balaam, What hast thou done unto me? I took thee to curse mine enemies, and, behold, thou hast blessed them altogether. And he answered and said, Must I not take heed to speak that which the LORD hath put in my mouth?