They shall be an abomination to you; you must not eat their meat, and you must detest their carcasses.
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...
Commenting on Leviticus 11:9-19
They shall be even an abomination to you,.... This is repeated again and again, to deter from the eating of such fishes, lest there should be any desire after them: ye shall not eat of their flesh, here mention is made of the flesh of fishes, as is by the apostle, Co1 15:39.
Lev 11:9-12 (cf. Deu 14:9 and Deu 14:10). Of water animals, everything in the water, in seas and brooks, that had fins and scales was edible. Everything else that swarmed in the water was to be an abomination, its flesh was not to be eaten, and its carrion was to be avoided with abhorrence.
Commenting on Leviticus 11:9-12