Numbers 22:18-20, 35

But Balaam answered Balak’s servants, “King Balak could give me his palace full of silver and gold, but I cannot disobey the LORD my God in anything, great or small. You stay here tonight as the other men did, and I will find out what more the LORD tells me.” That night God came to Balaam and said, “These men have come to ask you to go with them. Go, but only do what I tell you.”

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