Mark 10:2-8
10:2 Then some Pharisees came, and to test him they asked, “Is it lawful for a man to divorce his wife?”
10:3 He answered them, “What did Moses command you?”
10:4 They said, “Moses permitted a man to write a certificate of dismissal and to divorce her.”
10:5 But Jesus said to them, “He wrote this commandment for you because of your hard hearts.
10:6 But from the beginning of creation he made them male and female.
10:7 For this reason a man will leave his father and mother,
10:8 and the two will become one flesh. So they are no longer two, but one flesh.