Berean Standard Bible
Leviticus 20:17
“If a man marries his sister, whether the daughter of his father or of his mother, and they have sexual relations, it is a disgrace. They must be cut off in the sight of their people. He has uncovered the nakedness of his sister; he shall bear his iniquity.”

In context
15If a man lies carnally with an animal, he must be put to death. And you are also to kill the animal.
17If a man marries his sister, whether the daughter of his father or of his mother, and they have sexual relations, it is a disgrace. They must be cut off in the sight of their people. He has uncovered the nakedness of his sister; he shall bear his iniquity.
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Berean Standard Bible · A modern, readable English translation. Public domain (CC0).