I first learned about the Scythians in a small book written in 1880 about the Jewish Tribe of Dan. There was a very interesting analysis in the book comparing their oral history and origins.

https://www.amazon.com/Dan-Colonel-J-C-Gawler/dp/B002YBHRIQ/

The Scythians are fascinating.

I read some history that makes a good case that they are the lost Tribe of Dan from early Israel, as well as the basis for most Norse mythology.

EDIT: Source is this reprint from 1880 by Colonel J.C. Gawler. He even goes so far as phonetic analysis of the languages used, references and makes an extremely compelling case in my opinion.

I started researching the Tribe of Dan a couple of years back after realizing some parts of Greek mythology sounded a lot like references that Jewish history predated by 1,000 years. Specifically the Rod/Staff of Asclepius (a serpent on a staff for healing) sounded a lot like the poison healing bronze snake on a pole that Moses created in Numbers 21:9, which was then destroyed 800 years later in 2 Kings 18:4 because it had become an idol.

Dan was the seafaring, superstitious merchant tribe and that traded across the Mediterranean. There are a lot of notes that trace the origin of the Hercules legend to Samson, who I believe was from the Tribe of Dan as well.

It's really interesting stuff.

https://www.amazon.com/Dan-Colonel-J-C-Gawler/dp/B002YBHRIQ/