Numbers 22:18-20

18But Balaam replied to the servants of Balak, “If Balak were to give me his house full of silver and gold, I could not do anything small or great to go beyond the command of the LORD my God. 19So now, please stay here overnight as the others did, that I may find out what else the LORD has to tell me.”

20That night God came to Balaam and said, “Since these men have come to summon you, get up and go with them, but you must only do what I tell you.”