39:
We have seen [Tefillah 071] that the fact that when the kohanim [priests] invoke God's blessing they should do so "in love" was the major consideration that led to certain communities requiring the kohanim to perform this duty only on very special occasions. (To be specific: on YomTov which falls on a day other than Shabbat and only at the Musaf [Additional] service.) However, we have also seen [Tefillah 071] that in Israel it is customary for the kohanim to perform this ceremony every day, as was done in the Bet Mikdash. (However, even though this ceremony was performed in the Bet Mikdash also during the offering of the Minĥah sacrifice this is not done today - except on fast days - for fear that the priests may have drunk wine during the day, which would disqualify them temporarily fro performing the cenermony.)
40:
Regarding this ceremony today, whenever and wherever it is performed, I think that we can perceive three salient trends:
- there are priests who perform the ceremony as a matter of course;
- there are priests who excuse themselves because they feel uncomfortable about performing the ceremony;
- there are women who wish to perform the ceremony when men do.
There is no need to address the first item in our list. But let us now address the two remaining items.
41:
A man is identified as a kohen by inheritance from his father. In ancient times the priestly bureaucracy in the Bet Mikdash kept geneological records which would show who was a valid kohen and who was an invalid kohen (because of some imperfection in the line of descent). Of course, there are no such records today, and a man who says he is a kohen (because his father was a kohen) is credited as being a kohen, and he passes on that status to his male issue as a matter of course.
42:
We should, however, note parenthetically that it has recently become possible to verify that the systerm works! in 1997 Prof. Karl Skorecki and collaborators from Haifa, Israel, published in the most prestigious scientific journal "Nature" the results of a scientific investigation he had conducted. The bottom line was that a man who was a kohen had a distinguishing gene that he did not share with other men, and that the provenance of this gene could be traced back some 2600 years or more. Those interested in learning more about this development might find it useful to read a short "layman's" synopsis written by Talya Liben. Talya's paper can be accessed here.
43:
Let us return to our discussion. The Torah [Numbers 6:22-27] does not make this a voluntary mitzvah, whereby the decision to perform the ceremony or not to do so is left to the discretion of the individual kohen; the Torah instructs every kohen to perform this ceremony. Only a valid kohen who suffers from certain physical 'blemishes' or has committed certain acts is permanently excused from performing this mitzvah. We shall relate these invalidating factors to the actual mitzvah later on.
44:
Thus, every observant kohen should perform this ceremony whenever possible out of a feeling of love for the Jewish people. The reasons put forward by those valid kohanim who refrain from fulfilling the mitzvah usually have something to do with a subjective sense of unworthiness. This is entirely to misconstrue the ethos of the ceremony! The priest does not bless the congregation! No human being can do so. The priest invokes God's blessing on the congregation. That is to say that he is the physical channel through which we can hear God's blessing pronounced. Our tradition does everything possible to remove from the ceremony any 'personality', and it just leaves the voice, the words.
45:
Sometimes a kohen will claim that he is not fit to perform the ceremony because he does not observe all the mitzvot. This is completely irrelevant! In his halakhic compendium, Mishneh Torah [Tefillah 15:6] Rambam explains this most succinctly:


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