Mark 10:6 WEB

⁴  They said, 'Moses allowed a certificate of divorce to be written, and to divorce her.'

⁵  But Jesus said to them, 'For your hardness of heart, he wrote you this commandment.

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

⁷  For this cause a man will leave his father and mother, and will join to his wife,

⁸  and the two will become one flesh,' so that they are no longer two, but one flesh.