In response to my question, where is the ancient literary source and whom (?) is the historian responsible for citing the quote, my friend wrote back and verbatim, this is the text of his message:
<<<
The phrase "molon labe" comes from Plutarch's Moralia, "Sayings of
Spartans" (Apophthegmata Laconica), under Leonidas (reference is Mor.
225D). "Labe" is the imperative from "lambanO," take, and "molOn"
(second O is omega) is an aorist participle from the verb
blOskO/moloumai/emolon, to come or to go, so literally: coming, take!
Anyway, Plutarch found that somewhere attributed to Leonidas.
The other saying ("Then we'll fight in the shade") comes from Herodotus 7.226, attributed to Dienekes the Spartan (that doesn't seem to be in Plutarch's collection of sayings).
I've seen the phrase "molon labe" quoted online, not necessarily in
connection with gun rights... I suspect some of those 19th-century
Southern gentlemen who liked to read ancient history had come across
it... There were comparisons made between Thermopylae and the Alamo
within days of the fall of the Alamo, but don't know if anybody quoted
"molon labe" at that time... Another time the phrase might have been
used would have been the Civil War.
>>>
If the analysis of the Greek grammer makes sense to ya'll, more power to you. My friend forgets that he's talking to a former auto painter, and not my wife, who's the in-house Ancients scholar. Horge, it looks like you were 'way mo' closer than you thought.
I suppose the conclusion is that this documented quote, having been cited centuries (?) after the actual battle, is an indication that someone's (Plutarch's at least the first author) imagination may have embellished the incident into an even better tale.
I'll try to find out about the logistics and force of numbers.