Numbers 22:18-20

18Then Balaam answered and said to the servants of Balak, “Though Balak were to give me his house full of silver and gold, I could not go beyond the word of the Lord my God, to do less or more.

19Now therefore, please, you also stay here tonight, that I may know what more the Lord will say to me.”

20And God came to Balaam at night and said to him, “If the men come to call you, rise and go with them; but only the word which I speak to you—that you shall do.”