Numbers 24:13
'If Balak would give me his house full of silver and gold, I cannot pass the mouth of the LORD, to do either good or bad of mine own mind. What the LORD sayeth, that must I speak.'
Numbers 16:28
And Moses said, "Hereby ye shall know that the LORD hath sent me to do all these works, and that I have not done them of mine own mind:
Numbers 22:18
And Balaam answered and said unto the servants of Balak, "If Balak would give me his house full of silver and gold, I can go no further than the word of the LORD my God, to do less or more.
Numbers 22:20
And God came to Balaam by night and said unto him, "If the men come to fetch thee, rise up and go with them: but what I say unto thee, that only thou shalt do."