"Grain," "meal," and "meat" (as in KJV) all refer to the same type of non-animal, cereal-based sacrifice, which are more accurately be called a "grain" or "meal" offering in modern translations.


The Priests were all sons of Aaron who was a son of Levi. The Levites were all the sons of Levi.
The chart shows all the sons of Levi:

Pictures from biblestudentdaily.com with permission

Pictures from biblestudentdaily.com with permission
Priests laying hands on the bull for a sin offering (Leviticus 4 v 15)


Pictures from biblestudentdaily.com
The Laver is called a Basin in many modern translations.

Priests washing at the laver.

Picture from biblestudentdaily.org with permission


Inside the Holy and Most Holy place