While the Bible doesn't explicitly state someone married his sister in the way we understand marriage today, there are accounts that describe relationships that would be considered incestuous by modern standards, due to the limited population and different cultural norms of the time.
Here's a breakdown of how this issue appears in the Bible:
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Early Genesis Accounts: In the early chapters of Genesis, with a small population, close relations marrying was likely necessary to propagate the human race. The Bible doesn't explicitly condemn these unions. For example, Cain married his sister or a close female relative.
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Abraham and Sarah: As the provided reference states, Abraham (Abram) claimed Sarah was his sister to protect himself in Egypt. Genesis 20:12 reveals that Sarah was indeed Abraham's half-sister, the daughter of his father but not his mother: "Besides, she is indeed my sister, the daughter of my father but not the daughter of my mother, and she became my wife." While not a full sibling, it was a close familial relationship.
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Later Prohibitions: Later in the Old Testament, the Law of Moses (Leviticus 18 and 20) explicitly forbids sexual relations with close relatives, including sisters and half-sisters. These laws were given to the Israelites and didn't apply to people before that time.
Therefore, while no one is explicitly stated to have married his sister in a way that aligns with modern definitions and laws after those laws were given, Abraham married his half-sister, Sarah. This union occurred before the Mosaic law prohibited such relationships. The necessity of procreation in the early stages of humanity also suggests similar relationships occurred between siblings in the earliest biblical narratives.
