Twenty-Four Priestly Gifts
After the incident with Korach, and quiet was again restored, certain laws related to Kohanim, were presented.
The Kohanim were given a total of twenty-four gifts. Eight of these were given in the Beit Hamikdash itself. Aside from the לחם הפנים, the showbread, and the שתי הלחם, the bread offered on Shavuot, the other six involved the consumption of certain sacrifices.
There were four more gifts given to the Kohanim in Jerusalem. This included the ביכורים, first fruits and the first born animals.
Five more of the gifts were given in Eretz Yisrael. This included תרומה, the shearing of sheep, and the חלה, the dough separated when baking bread.
The last five were given to the Kohanim anywhere in the world. The most famous would be the silver coins given to the Kohein for Pidyon Haben.
It was advantageous to be a popular Kohein. Many of these gifts could be given to the Kohein of your choice. It seems obvious that one would choose a Kohein that he liked. Therefore, a popular Kohein would receive a lot more than one who had a bad personality.