Numbers 22:18-20, 35

But Balaam answered them, “Even if Balak gave me all the silver and gold in his palace, I could not do anything great or small to go beyond the command of the LORD my God. Now spend the night here so that I can find out what else the LORD will tell me.” That night God came to Balaam and said, “Since these men have come to summon you, go with them, but do only what I tell you.”

The angel of the LORD said to Balaam, “Go with the men, but speak only what I tell you.” So Balaam went with Balak’s officials.