Priests are live on the offerings made to the Lord

Deuteronomy 18:1-8
Talked about the revenue of the priest and Levites.
The priests, who are Livites, are have no allotment or inheritance with Israel. They shall live on the offerings made to the Lord by fire for that is their inheritance.
For the Lord has chosen them and their descendants out of all your tribes to stand and minister in the Lord's name always.
If a Levite moves from one of your towns anywhere in Israel where he is living, and comes in all earnest to the place the Lord will choose, he may minister on the name of the Lord his God like all his fellow Levites who serve there in the presence of the Lord. He is to share equally their benefits.
Why?
The priests are devoted to the Lord, and he is chosen by the Lord, his inheritance is not same as other tribes or other people earnest.
The priest, the Levites are serving the Lord, so he may share due the priest from the people who sacrifice a bull or a sheep an others.
To be a servant of the Lord is chosen by the Lord, for he is living for the Lord, he share the offerings from the people to the Lord. His living style are different as others.
The movement of priest is come from the earnest to the place the Lord will choose.
How?
My serving and destination is chosen by the Lord. May the holy spirit disciplines me to know which way is the Lord chooses for me, and work on it in faith.
A christian have to take care of the servant of the Lord, same as the tithe.