Of all the creatures that live in the water, whether in the seas or in the streams, you may eat anything with fins and scales.
9 These shall ye eat of all that are in the waters. Here, also, some who know little of religion, plausibly contend that God is acting the physician’s part, and distinguishing wholesome from unwholesome food. But although their opinion is sufficiently refuted by medical men themselves, yet, even if I should admit what they desire, they reason badly.
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
These shall ye eat of all that are in the waters,.... In the waters of the sea, or in rivers, pools, and ponds; meaning fishes; for though some persons abstain from eating them entirely, as the Egyptian priests, as Herodotus (m) relates; and it was a part of religion and holiness, not with the Egyptians only, but with the Syrians and Greeks, to forbear eating...