See source hereThe biblical command "צו" (tzav) in Leviticus 6:2, which instructs Aaron and his sons regarding the burnt offering. Commentaries like Rashi explain "צו" as a call to zealousness, especially where financial loss ("chisaron kees") is a concern. This concern is debated among the sources, with some suggesting it relates to the Kohanim receiving only the animal's hide, potentially leading to laziness ("atzlah"). Other interpretations of "chisaron kees" include the effort of maintaining the fire all night or even a financial strain on the community. The necessity for this extra encouragement is discussed, contrasting the burnt offering with other sacrifices where the priests have a greater share, thus naturally motivating their diligent service. Ultimately, the commentaries seek to understand why this specific commandment requires a strong urging for continuous and dedicated priestly labor.