Mark 10:8 (KJV)

And he answered and said unto them, What did Moses command you?

And they said, Moses suffered to write a bill of divorcement, and to put her away.

And Jesus answered and said unto them, For the hardness of your heart he wrote you this precept.

But from the beginning of the creation God made them male and female.

For this cause shall a man leave his father and mother, and cleave to his wife;

What therefore God hath joined together, let not man put asunder.

And in the house his disciples asked him again of the same matter.

And he saith unto them, Whosoever shall put away his wife, and marry another, committeth adultery against her.

And if a woman shall put away her husband, and be married to another, she committeth adultery.

And they brought young children to him, that he should touch them: and his disciples rebuked those that brought them.