system
A chat on subreddit /r/NoStupidQuestions
human
In the Torah, the reason for the kosher rules is to make ourselves holy. The section in the Torah where the kosher laws are given is parshat shemini. 

In that section, it begins with some narrative: The Jews are offering sacrifices to Gd and two of Aarons sons are killed by a ball of fire from Gd that comes from the altar. 

Moses tells Aaron not to mourn the loss of his sons in order to not anger Gd. 

Then Gd tells the Jews that there is a difference between the holy and the forbidden.  After this, Gd gives the rules for eating Kosher. 

This type of commandment is called chukkim, which means that it is not a practical type of law.  This means that we follow the chukkim rules because Gd said so, NOT because of cleanliness or parasites or anything like that. 

Hope this helps.
gpt
Oh a ball of fire from an altar. Sounds legit.