Mark 10:4-9

4And they said, Moses suffered to write a bill of divorcement, and to put her away.

5And Jesus answered and said unto them, For the hardness of your heart he wrote you this precept.

6But from the beginning of the creation God made them male and female.

7For this cause shall a man leave his father and mother, and cleave to his wife;

8And they twain shall be one flesh: so then they are no more twain, but one flesh.

9What therefore God hath joined together, let not man put asunder.