Genesis 2:18

2:18 The Lord God said, “It is not good for the man to be alone. I will make a companion for him who corresponds to him.”

Genesis 2:24

2:24 That is why a man leaves his father and mother and unites with his wife, and they become a new family.

Matthew 19:4-6

19:4 He answered, “Have you not read that from the beginning the Creator made them male and female, 19:5 and said, ‘For this reason a man will leave his father and mother and will be united with his wife, and the two will become one flesh’? 19:6 So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.”

Matthew 19:8

19:8 Jesus said to them, “Moses permitted you to divorce your wives because of your hard hearts, but from the beginning it was not this way.