Mark 10:8

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

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

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

What therefore God has joined together, let no man separate.”

In the house, his disciples asked him again about the same matter.

He said to them, “Whoever divorces his wife and marries another commits adultery against her.