Yoma 27B

הוי אומר זה טלה.

You must say that this is the lamb of the morning daily offering, concerning which the Torah commands that a new woodpile be prepared every day and that the altar must be lit anew each morning. Therefore, although the verse is ostensibly speaking of a bull, it also alludes to the lamb of the daily offering and to the fact that it should be brought by 6 priests.

אמר רבי אסי אמר רבי יוחנן: זר שסידר את המערכה חייב. כיצד הוא עושה ⁠— פורקה וחוזר וסודרה. מאי אהני ליה? אלא: פורקה זר, וסודרה כהן.

§ R' Asi said that R' Yoḥanan said: A non-priest who set up the arrangement of wood on the altar is liable to receive the death penalty by God’s hand for having performed an act that is restricted to priests, and the woodpile that he placed is invalid. What should he do to repair the woodpile? He should dismantle it and then rearrange it. The Talmud is surprised at this: What good would this do for the woodpile? How would it help for the non-priest himself to rearrange the wood? It would be just as invalid as it was the first time. Rather, one must say that the non-priest should dismantle it, as there is nothing wrong with a non-priest dismantling the woodpile, and a priest then rearranges it.

מתקיף לה רבי זירא: וכי יש לך עבודה שכשירה בלילה ופסולה בזר?

R' Zeira strongly objects to R' Yoḥanan’s teaching: And do you have any service that is valid if performed at night and yet is invalid if performed by a non-priest? A bona fide Temple service must be performed during the day. That the wood on the altar may be arranged while it is still nighttime shows that it is not a bona fide service, and therefore it should be permitted for non-priests to perform it.