The relevant verse is a rather well-known one, namely Col. 3:11.
I examined the ancient history section of my local library today, and I didn't find a single book that treats the Scythians in any depth. I only found a one page section about them in one of the books. Establishment historians typically treat only a select few peoples, such as the Sumerians, ancient Egyptians, ancient Greeks, and Romans, while brushing others out of the picture entirely. This is an arbitrary choice in focus, and the fact that almost all historians have been doing it for over a hundred years is very suspect. I am, of course, merely reiterating points that Asha Logos has made, and I recommend his videos as an introduction to some of the understudied peoples.
Anyway, the book that did mention them also noted the above Biblical reference. This came as a surprise to me; I've read Colossians before, but I always read over this mention of the Scythians. It's interesting how Paul contrasts them with barbarians; those refer to non-Greek speaking people, so it appears that the Greeks had come to identify themselves with Scythians. In fact, perhaps he isn't even talking about the Royal Scythians here, but simply about the Greeks. But separately from this, it is a fact that the Scythians were still relevant at this time.
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