It is lawful for man to have three kinds of food that the earth produces.
The first kinds is the seeds. Wheat, barley, rice, and chick-pea as well as the other kinds of sesame and the like -all these are legally eatable as long as they form food for people and strengthen the body. Except in cases of emergency, everything that harms the human body is illegal to have.
The second kind is all the kinds of fruits that form food for human bodies and strengths. All these kinds are legally eatable. The forbidden are only those that form harm.
The third kind is all classes of greens and plants that benefit human beings and form food for them. All these classes are legal to have. The other classes of greens that harm the human body, such as the poisonous legumes and oleander, are illegal to have.
The legally eatable meat is the meat of cows, sheep, camels and the other beasts except those having tusks or claws. Regarding the birds, the meat of very bird that has gizzard is legally eatable. Accordingly, the meat of every bird that does not have gizzard is illegal.
Every egg the edges of which are uneven is legally eatable, while the eggs the edges of which are equal are illegal.
Regarding the fish, it is legal to have the meat of every fish that has shells while it is illegal to have the meat of every fish that does not have shells.