An old, terrible lie has resurfaced.

The video above is part of an interview with Osama Hamdan, head of international relations for Hamas. on the Lebanese Al-Quds TV channel on July 28, 2014. In it he makes the assertion that Jews have a custom of killing non-Jewish children and using their blood to make Passover matzah.

The belief that Jews kill people, usually children, and use their blood in rituals or to make matzah is called the Blood Libel. It is a lie. It is a particularly baffling lie in that Jewish dietary law forbids the eating of any blood: blood is drained from animals before butchering, and meat is salted to remove any stray drops of blood.

The Blood Libel has been around a long time. Apion, a Greek who hated Jews wrote about it in the first century CE. It then pops up periodically, but the first major European case was in 1144, in Norwich, England. In the Middle Ages, these accusations followed a pattern: a body was found, or a child disappeared, and the Jews were accused of the crime. Elaborate fantasies about the supposed rituals were imagined and written down by the accusers, which then became fodder for the next case. For more detail about it, there is an excellent but heartbreaking article in the Jewish Virtual Library.

The Blood Libel has continued in the modern era. The Protocols of the Elders of Zion is an anti-Semitic document that was distributed by the Russian secret police in 1905. It is a catalogue of all the ancient lies about the Jews, repackaged for the 20th century. Henry Ford distributed it in the United States. It included the Blood Libel as well as other medieval stories about Jews poisoning wells, spreading plague, and so on. It was used by the Nazis to justify the Holocaust. And now, in the 21st century, it continues to circulate on the internet, and it has surfaced in Islamist talking points.

The important thing to know about the Blood Libel is that it is a lie without any kernel of truth. Observant Jews do not eat blood of any kind, ever. All Jews categorically reject human sacrifice. And despite what Mr. Hamdan says, the Blood Libel is not in any of our books. It is only in the books fabricated by sick minds to poison the world against Jews.

I really hate this topic. I hate teaching it and writing about it, but tragic experience has taught us that these lies are extremely dangerous. May the day come, and speedily, when all such horrors are finally behind us.