Six million jews

A threat relating to six million jews appeared in the public record many years before the Wannsee Conference and the "final solution" of WW2 Germany.

The source for the number of six million is an interpretation of Leviticus 25:10 which is based on a missing letter in the Hebrew word for return. The Zohar uses the Gematria value of that word to arrive at the year that the state of Israel declared independence.

Rabbi Benjamin Blech lays out the interpretation at 44:00 - 51:00.

https://www.youtube.com/watch?v=uFVs2lrdozs

And ye shall hallow the fiftieth year, and proclaim liberty throughout all the land unto all the inhabitants thereof: it shall be a jubile unto you; and ye shall return every man unto his possession, and ye shall return every man unto his family.
Leviticus 25:10

וקדשתם את שנת החמשים שנה וקראתם דרור בארץ לכל ישביה יובל הוא תהיה לכם ושבתם איש אל אחזתו ואיש אל משפחתו תשבו

תשבו vs תשובו
400 + 300 + 2 + 6 = 708 -> 1948 CE (missing waw= 6)