Numbers 24:13
If Balak would give me his house full of silver and gold, I cannot go beyond the commandment of the LORD, to do either good or bad of my own heart; but what the LORD saith that will I speak?
Numbers 16:28
And Moses said, Hereby ye shall know that the LORD has sent me to do all these works, for I have not done them out of my own heart.
Numbers 22:18
And Balaam answered and said unto the slaves of Balak, If Balak would give me his house full of silver and gold, I cannot go beyond the word of the LORD my God, to do anything small or great.
Numbers 22:20
And God came unto Balaam at night and said unto him, If the men come to call thee, rise up, and go with them; but yet the word which I shall say unto thee, that shalt thou do.