Have ye not read...? — The answer to the question is found not in the words of a code of laws, but in the original facts of creation. That represented the idea of man and woman as created for a permanent relationship to each other, not as left to unite and separate as appetite or caprice might prompt.
Related Commentaries of Matthew 19:4
Matthew 19:4
4 And he answered and said unto them,Have ye not read, that he which made them at the beginning made them male and female,