On Tue, 12 May 1998, Shachihoko wrote:

Hmmmm ... I'm curious if there's anyone on the list who's actually *read*
a translation of the Dead Sea Scrolls - I don't expect that anyone has,
but it could be interesting to see whether the Scrolls actually had
something like the seventeen trials or the "messengers" which you're
referring to.

In Viz's Evangelion manga translation the letter column mentions an example or
two in the letter column (from the angels in the Bible, not the Dead Sea
Scrolls) of angels in the series that were taken from the original source.