Matthew Henry on Leviticus 11:9-19
Here is, 1. A general rule concerning fishes, which were clean and which not. All that had fins and scales they might eat, and only those odd sorts of water-animals that have not were forbidden, Lev 11:9, Lev 11:10. The ancients accounted fish the most delicate food (so far were they from allowing it on fasting-days, or making it an instance of mortification to eat fish); therefore God did not lay much restraint upon his people in them; for he is a Master that allows his servants not only for necessity but for delight. Concerning the prohibited fish it is said, They shall be an abomination to you (Lev 11:10-12), that is, "You shall count them unclean, and not only not eat of them, but keep a…
Read the whole note in the consoleJamieson-Fausset-Brown on Leviticus 11:12
Whatsoever hath no fins nor scales, &c.--Under this classification frogs, eels, shellfish of all descriptions, were included as unclean; "many of the latter (shellfish) enjoy a reputation they do not deserve, and have, when plentifully partaken of, produced effects which have led to a suspicion of their containing something of a poisonous nature."
Adam Clarke on Leviticus 11:9
Whatsoever hath fins and scales - Because these, of all the fish tribe, are the most nourishing; the others which are without scales, or whose bodies are covered with a thick glutinous matter, being in general very difficult of digestion.
John Gill on Leviticus 11:12
Whatsoever hath no fins nor scales in the waters,.... Which is repeated that they might take particular notice of this law, and be careful to observe it, this being the only sign given:
that shall be an abomination unto you; the Targum of Jonathan says, that not only the flesh of such fish, but the broth, and pickles made of them, were to be an abomination; which contradicts what Pliny (t) relates, that the Jews made a pickle of fishes that lacked scales; so Grotius understands him: this law of the Jews is taken notice of by Porphyry (u), who says, it is forbidden all the Jews to eat horse flesh, or fishes that lack scales, or any animal that has but one hoof: and Pliny (w), from an ancient…