The Torah can be written on parchment from the hide of any kosher animal. As a practical matter ...
since they produce the most 'real-estate' from a single hide ... the beefs are the virtually unanimous
choice nowadays.
Parts of kosher dead animal: parchment and thread made out of kosher dead animal.
There was no paper then.
The parchment on which a kosher Torah scroll is hand-written is cured from the hide of a kosher animal.
Kosher food. Kosher animal species are called Tahor (ritually pure) in the Torah.
The Torah is traditionally written on parchment made from the skin of kosher animals, typically sheep, goats, or calves. This parchment, known as "klaf," is prepared through a meticulous process that involves tanning and smoothing the animal skin. The use of kosher animal skins is significant, as it aligns with Jewish dietary laws and the spiritual sanctity of the Torah.
Parchment from the skins of kosher animals.
If it's a kosher animal slaughtered according to Halakha (Torah-law), then what remains forbidden are the sciatic nerve, certain lumps of fat in the abdomen, and the blood.
The milk of any kosher land animal can be used to make kosher powdered milk.
The Torah.
Kosher ink
The history of kosher (Kashrut; kosher laws; kosher foods) is part of the Torah-history itself, meaning that it goes as far back as the Torah does because it is based on the Torah and is a part of it. Many of the basic Kashrut laws are stated explicitly in the Torah (see Leviticus ch. 11).
Hanukkah is a holiday, while "kosher" is an adjective referring to food which is made in accordance with the Torah-rules for preparing food. Celebrating a "kosher" Hanukkah, it would mean that any foods served during the holiday were kosher.