Numbers 22:35

Go with the men I allow thee to go upon the following terms. It must have tended to convince the Moabites how much Israel was under the divine protection, to see that Balaam, covetous as he was, and even after such great rewards were set before him, durst not imprecate evil against that people. Only the word that I shall speak, &c. These words may be understood as a prediction, as well as a command; importing that he would find himself unable to pronounce either more or less about Israel than what God would put in his mouth.