I suspect that this is one of those things that all you Americans know right off the bat, but as a Northern European growing up in a very secular (and ignorant) household, I’m puzzled. I am of course referring to Leviticus, chapter 11:
“All flying insects that walk on all fours are to be detestable to you. There are, however, some winged creatures that walk on all fours that you may eat: those that have jointed legs for hopping on the ground. Of these you may eat any kind of locust, katydid, cricket or grasshopper. But all other winged creatures that have four legs you are to detest.”
“You are to consider detestable all swarming insects that walk along the ground. However…[the locust/cricket exception]…But you are to consider detestable all other swarming insects that walk or crawl.”
I though that this might be something that was copied from the King James Bible, but the description is present in the Vulgate:
“Omne de volucribus quod graditur super quatuor pedes, abominabile erit vobis. 21 Quidquid autem ambulat quidem super quatuor pedes, sed habet longiora retro crura, per quæ salit super terram, 22 comedere debetis, ut est bruchus in genere suo, et attacus atque ophiomachus, ac locusta, singula juxta genus suum. 23 Quidquid autem ex volucribus quatuor tantum habet pedes, execrabile erit vobis.”
I’m not sure how far back the phrase “on all fours” goes, but I suspect that it is just a figure of speech that was picked up at some point and made its way into most translations.
The verses in Lev XI 20-23 are dealing with critters that hop about like crickets. Insects that have four legs and then a third pair that are used for hopping are kosher (like those mentioned). The author does not see insects as having three pairs of legs, but as having two pairs of legs and a third pair. The function of the third pair determining if the being is suitable for lunch or an appetizer.
Crawling things, many legged critters, and other internal skeletonally challenged animals are forbidden later on in verse 42.
Well, I just get the impression that Americans are a lot more concerned about and educated on religious subjects, certainly about the Bible, than my particular demographic, which is Northern European, as we have long since stopped giving a toss about this whole Christianity thing, and replaced it with science and rationality and stuff. I just figured that this might be one of those cases where you would go “oh, that’s because of the Greek term for blah blah and the King James Translation being blah blah! Didn’t your grandmother teach you anything?!” Guess I was wrong in this case.
You have to remember, not counting the legs on bugs isn’t exactly out of character for the level of ignorance in the bible. They couldn’t be bothered to count the number of ribs in a woman.
Insofar as I recall, when someone in the west *did *bother to count ribs it caused a controversy. It probably was just self evident that they had four legs and no one had the gumption to question it.