Numbers 22:18-20

18And Balaam answered and said to the servants of Balak, If Balak give me his house full of silver and gold, I could not go beyond the commandment of Jehovah my 1God, to do less or more.

19And now, I pray you, abide ye also here this night, and I shall know what Jehovah will say to me further.

20Then 2God came to Balaam at night, and said to him, If the men have come to call thee, rise up, [and] go with them; but only what I shall say unto thee shalt thou do.