Leviticus 18:22 - You shall not lie with a male as with a woman; it is an abomination.
Leviticus 20:13 - If a man lies with a male as with a woman, both of them have committed an abomination; they shall surely be put to death; their blood is upon them.
Matthew 19:4-6 - He answered, ‘Have you not read that the one who made them at the beginning “made them male and female”, and said, “For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh”? So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.
And there are a couple more. It is disputed.