Numbers 22:18-20, 35

But Balaam responded to Balak’s messengers, “Even if Balak were to give me his palace filled with silver and gold, I would be powerless to do anything against the will of the LORD my God. But stay here one more night, and I will see if the LORD has anything else to say to me.” That night God came to Balaam and told him, “Since these men have come for you, get up and go with them. But do only what I tell you to do.”

But the angel of the LORD told Balaam, “Go with these men, but say only what I tell you to say.” So Balaam went on with Balak’s officials.