LEVITICUS 11 and DEUTERONOMY 14

LEVITICUS 11 and DEUTERONOMY 14
 
These two chapters and books talk about what “YOU MAY EAT,” and what “YOU SHALL NOT EAT.”
 
Who commanded it and why?
 
The Answers:
 
Hashem spoke to Moses and to Aaron, saying to them. Speak to the Children of Israel, saying: These are the creatures that you may eat from among all the animals that are upon the earth.
:1-2
 
For you are a holy people to Hashem, your God, and Hashem has chosen you for Himself to be a treasured people, from all the peoples on the face of the earth.
You shall not eat any abomination.
:2-3
 
*Now, the question is (as usual):
 
Who gave the right or authority to “change” what Hashem/G-d had said?
 

Everything among the animals that has a split hoof, which is completely separated into double hooves, and that brings up its cud – that one you may eat.
Leviticus 11:3

Among all [creatures] that are in the water, you may eat these: Any [of the creatures] in the water that has fins and scales, those you may eat, whether [it lives] in the waters, in the seas or in the rivers.
v. 9

v. 13-19 (can be understood as those birds that does not prey with other animals may be considered as clean).

However, among all the flying insects that walk on four [legs], you may eat [from] those that have jointed [leg like] extensions above its [regular] legs, with which they hop on the ground.
From this [locust] category, you may eat the following: …
v. 21-22