Gifts of appreciation[1]
וזה יהיה משפט הכהנים מאת העם מאת זבחי הזבח אם-שור אם-שה ונתן לכהן הזרע והלחיים והקבה
This will be the law for the Kohanim: Those from the nation who slaughter a cow or a sheep will give to the Kohen the [animal’s] shoulder, cheeks, and stomach[2]
Hashem’s chosen family for the Temple service is the Kohanim, the descendants of Aharon. What comes with this responsibility is certain gifts. The rest of the nation are commanded to give some of the produce to Kohanim, as well as the choicest parts of their animals. The gemarra asks[3] a simple question: If a Kohen grabs away the gifts owed to them from the original owner, is that showing that they cherish the mitzvah? Or is that disrespectful to the mitzvah. The gemarra answers that the Torah says for the non-Kohen to give the animal parts to the Kohen, not that the Kohen should take it.