The Pharisees object by reminding Jesus Moses allowed men to issue certificates of divorce and thereby to separate from their wives. (religion-online.org)
They said to him, «Why then did Moses command one to give a certificate of divorce, and to put her away?» (religion-online.org)
Matthew 19:7 «They said to Him, «Why then did Moses command to give a certificate of divorce, and to put her away?» (religion.blogs.cnn.com)