כִּֽי־יִהְיֶ֤ה בְךָ֙ אִ֔ישׁ אֲשֶׁ֛ר לֹא־יִהְיֶ֥ה טָה֖וֹר מִקְּרֵה־לָ֑יְלָה וְיָצָא֙ אֶל־מִח֣וּץ לַֽמַּחֲנֶ֔ה לֹ֥א יָבֹ֖א אֶל־תּ֥וֹךְ הַֽמַּחֲנֶֽה׃
S’il se trouve dans tes rangs un homme qui ne soit pas pur, par suite d’un accident nocturne, il se retirera du camp, où il ne rentrera pas.
Rashi
ויקרא אל משה AND [THE LORD] CALLED UNTO MOSES — All oral communications of the Lord to Moses whether they are introduced by דבר or by אמר or by צו were preceded by a call (to prepare him for the forthcoming address) (cf Sifra, Vayikra Dibbura d'Nedavah, Chapter 1 1-2). It is a way of expressing affection, the mode used by the ministering angels when addressing each other, as it is said (Isaiah 6:3) “And one called unto another [and said, Holy, holy, holy is the Lord of hosts]”. To the prophets of the nations of the world, however, God revealed himself in a manner which Scripture describes by an expression ordinarily used for denoting events of a casual character and of uncleanness, as it is said, (Numbers 23:4) “and God happened to meet (ויקר) Balaam” (the term ויקר, from the root ,קרה, is connected with מִקְרֶה which denotes “chance”, “occurrence”, and has also the meaning of “uncleanness”, by analogy with Deuteronomy 23:11: לא יהיה טהור מקרה לילה) (cf. Bereishit Rabbah 52:5).
English Explanation of Mishnah Tamid
If one of them had a seminal emission, he used to go out and make his way down the winding stairs which went under the Birah, and which was lit by lights on each side until he reached the bathing place. There was a fire close by and an honorable seat [i.e. toilet]: and this was its honor: if he found it locked, he knew there was someone there; if it was open, he knew there was no one there. He would go down and bathe and then come up and dry himself and warm himself in front of the fire. He would then go and take his seat next to his fellow priests until the gates were opened, when he would take his departure. This section describes what would happen if one of the priests had a seminal emission while sleeping in the Temple. According to Deuteronomy 23:11 such a person must leave the “camp”, which the rabbis interpret to be parallel to the Temple. The priest would exit the Temple by using a set of underground stairs. It was forbidden for him to walk through the courtyard, or even on the Temple mount because he was impure. These stairs were lit so that he could see his way. He would then come to the ritual bath and a private toilet. The mishnah notes that a private toilet was unique generally toilets were used by a number of people at the same time. So unique was this toilet that it was even called “The Seat of Honor.” After taking care of his needs, he would bathe and then warm up next to the fire kept there for his comfort (sounds like a spa!). He would then go back to the other priests until the gates of the Temple were opened, when he would exit. He could not go serve in the Temple because he was not fully pure until the following evening. However, since he had been to the mikveh, he was no longer impure, so he could exit through the normal gates.
Or HaChaim
And its stating, "and the darkness, he called night;" is an expression of an incident which is not pure; and for this reason, the verse does not rely on the word, "and he called" that it stated at the beginning [of the verse, and repeated it again specifically for darkness] - since there is no more glory and honor to darkness, but rather its incidence will only be in the night. And this is the secret of its stating (Deuteronomy 23:11), "an incident of the night." But when the night will pass, which is the time of the exile, as the verse states (Isaiah 21:11), "The burden of Dumah etc.; watchman, what will be of the night;" since the exile is similar to the night. And then at the dawn, there will no longer be darkness nor night, but [rather], "and there was evening and there was morning, one day;" since the aspect of evil is removed and is not; 'and the night will shine like the day,' 'and the light of the moon will be light the light of the sun.' And this is [why] it states, "one day;" and it is that the verse hints to its stating (Zechariah 14:9), "on that day the Lord will be one and His name will be one."