Numbers 22:35

22:35 But the angel of the Lord said to Balaam, “Go with the men, but you may only speak the word that I will speak to you.” So Balaam went with the princes of Balak.

Numbers 22:38

22:38 Balaam said to Balak, “Look, I have come to you. Now, am I able to speak just anything? I must speak only the word that God puts in my mouth.”

Numbers 24:13

24:13 ‘If Balak would give me his palace full of silver and gold, I cannot go beyond the commandment of the Lord to do either good or evil of my own will, but whatever the Lord tells me I must speak’?