'Cannot' in the Bible

And Balaam answered and said unto the servants of Balak, If Balak would give me his house full of silver and gold, I cannot go beyond the word of Jehovah my God, to do less or more.

Behold, I have received commandment to bless: And he hath blessed, and I cannot reverse it.

If Balak would give me his house full of silver and gold, I cannot go beyond the word of Jehovah, to do either good or bad of mine own mind; what Jehovah speaketh, that will I speak?