Matthew 19:6-8

Young's Literal Translation

⁶ so that they are no more two, but one flesh; what therefore God did join together, let no man put asunder.'

⁷ They say to him, `Why then did Moses command to give a roll of divorce, and to put her away?'

⁸ He saith to them -- `Moses for your stiffness of heart did suffer you to put away your wives, but from the beginning it hath not been so.