Mark 10:5-9 And Jesus answered and said to them, He wrote you this precept because of the hardness of your hearts.

MKJV⁽ⁱ⁾ ⁵ And Jesus answered and said to them, He wrote you this precept because of the hardness of your hearts. ⁶ But from the beginning of the creation God made them male and female. ⁷ For this cause a man shall leave his father and mother and shall cleave to his wife. ⁸ And the two of them shall be one flesh. So then they are no longer two, but one flesh. ⁹ Therefore what God has joined together, let not man put apart.