Sefer HaMitzvot · Negative Commandments, Chapter 76
1
שהזהיר הכהן טבול יום מעבוד אע"פ שטהר עד שיעריב שמשו. והוא אמרו בכהנים ולא יחללו שם אלהיהם, והעובר על לאו זה חייב מיתה בידי שמים, ולא בא בו כתוב מבואר בתורה אבל הוא מקובל, וכהן טבול יום ששמש חייב מיתה. ובפ"ט בסנהדרין (שם) אמרו בפירוש קדושים יהיו לאלהיהם ולא יחללו אם אינו ענין לטמא בעבודה שכבר התבאר תנהו ענין לטבול יום ששמש ויליף חלול חלול ומנו אותו בכלל מחוייבי מיתה. (אמור, שם):
That He prohibited a priest that has immersed on that day (tevul yom) from serving [in the Temple] - even though he has has purified himself - until [that evening]. And that is His saying about the priests, "and not desecrate the name of their God" (Leviticus 21:18). And one who transgresses this negative commandment is liable for death at the hands of the Heavens. Yet a clear verse did not appear about it, but it has rather been passed down. [...] And in Chapter 9 of Sanhedrin (Sanhedrin 83b), they said in the explanation, "'They shall be sacred to their God and they shall not desecrate the name of their God' (Leviticus 21:6). If [this verse] is not written with regard to the matter of an impure priest who performed the service, [as that has already been explained,] then apply it to the matter of a priest who immersed that day who served. And it learns it out from [a verbal analogy of the word,] desecration [in both places]." And they listed him among the group of those liable for death. (See Parashat Emor; Mishneh Torah, Admission into the Sanctuary 4.)
שהזהיר הכהן טבול יום מעבוד אע"פ שטהר עד שיעריב שמשו. והוא אמרו בכהנים ולא יחללו שם אלהיהם, והעובר על לאו זה חייב מיתה בידי שמים, ולא בא בו כתוב מבואר בתורה אבל הוא מקובל, וכהן טבול יום ששמש חייב מיתה. ובפ"ט בסנהדרין (שם) אמרו בפירוש קדושים יהיו לאלהיהם ולא יחללו אם אינו ענין לטמא בעבודה שכבר התבאר תנהו ענין לטבול יום ששמש ויליף חלול חלול ומנו אותו בכלל מחוייבי מיתה. (אמור, שם):
That He prohibited a priest that has immersed on that day (tevul yom) from serving [in the Temple] - even though he has has purified himself - until [that evening]. And that is His saying about the priests, "and not desecrate the name of their God" (Leviticus 21:18). And one who transgresses this negative commandment is liable for death at the hands of the Heavens. Yet a clear verse did not appear about it, but it has rather been passed down. [...] And in Chapter 9 of Sanhedrin (Sanhedrin 83b), they said in the explanation, "'They shall be sacred to their God and they shall not desecrate the name of their God' (Leviticus 21:6). If [this verse] is not written with regard to the matter of an impure priest who performed the service, [as that has already been explained,] then apply it to the matter of a priest who immersed that day who served. And it learns it out from [a verbal analogy of the word,] desecration [in both places]." And they listed him among the group of those liable for death. (See Parashat Emor; Mishneh Torah, Admission into the Sanctuary 4.)