Rambam - 1 Chapter a Day

What is the order in which the priestly garments should be put on? [The priest] should put on the leggings first,1 tying them above his navel, over his loins. Afterwards, he puts on the tunic and then puts on the sash at elbow height. He should wind it fold after fold2 until it ends and then tie it.

With regard to the sash, [where it should be placed can be understood from] the received tradition. [Ezekiel 44:18] states: "They shall not gird themselves bayeza, [interpreted3 to mean] "in a place where one perspires."4 Yonason, the son of Uziel,5 received the same tradition from the prophets6 and translated the phrase: "They will gird themselves over the heart."7

Afterwards, he should arrange the headpiece as a hat.8

After the High Priest girds himself with the sash,9 he puts on the cloak, and on the cloak, the ephod and the breastplate. He girds himself with the belt of the ephod over the cloak, below the breastplate. Therefore [the cloak] is called "the cloak of the ephod,"10 the cloak that is girded closed with the ephod.

Afterwards, he winds the headgear like a turban. He ties the forehead plate [behind his head,] above the turban.11 His hair was visible between the forehead plate and the turban and it is in that place that he would wear his tefillin between the forehead plate and the turban.12

It is a positive commandment to make these garments and for the priests to serve in them,13 as [Exodus 28:2] states: "And you shall make holy garments,"14 and [ibid. 29:8] states: "And drew near his sons and dress them in tunics."15

When a High Priest serves with less than these eight garments or an ordinary priest serves with less than these four garments, he is called lacking garments. His service is invalid and he is liable for death at the hand of Heaven, like a non-priest who serves. [This is indicated by ibid.:9 which states:] "And you shall gird them with a sash... and their priesthood shall be for them...." [Implied is that] when their garments are upon them, their priesthood is upon them. [Conversely,] if their garments are not upon them, they are like non-priests, concerning whom [Numbers 1:51] states: "A non-priest who draws close [to the service of the Sanctuary] shall die."16

Just like a priest who is lacking garments is liable to die and invalidates the service he performs, so too, one who wears extra garments17 - e.g., he wears two tunics, two sashes, or an ordinary priest who wears the garments of the High Priest and performs service - profanes his service and is liable for death at the hand of Heaven.18

It is said with regard to the priestly garments:19 "on his flesh and he shall wear them." [Implied is that] nothing should intervene between his flesh and the garments. Even if there is one thread, earth, or a dead louse between his flesh and the [priestly] garment, it is considered an intervening substance and his service is invalid. Therefore a priest cannot serve [in the Temple wearing] his arm tefillin, because they intervene. The head tefillin, by contrast, do not intervene20 and if he desires to wear them at the time of his Temple service, he may.21

[A priest] must be careful at the time that he puts on [the priestly garments] that there be no dust, nor a louse - even if it is alive - between his flesh and the garment. Nor should air enter between his flesh and his garment during the time of service so that the garment will become distant from his flesh. He should not place his hand in his bosom under his tunic. He should not remove his hair from the garment, nor should there be a strand hanging loose from the garment. [Although] one these factors occurs, his service is acceptable.22

[The following rules apply if a priest] wrapped a cloth on his flesh in a place [untouched by the priestly] garments, e.g., he wrapped it on his finger or on his heel. If it is three fingerbreadths by three fingerbreadths,23 it is considered as an intervening substance and it invalidates [the service]. If it is smaller than that, it is not considered as an intervening substance.24

A small belt, since it is considered as an independent garment, invalidates [one's service] even if it is not three fingerbreadths by three fingerbreadths in area.

When the finger of a priest is wounded, he is permitted to tie a reed or a cloth that is not three fingerbreadths by three fingerbreadths around it on the Sabbath and perform his service.25 If he intends to release blood, it is forbidden.26 [Leniency is granted,] provided the reed or the cloth does not intervene between his flesh and a sacred utensil27 at the time of service.28

In the Second Temple,29 they made the Urim and the Tumim30 to complete the eight garments [of the High Priest]31 even though inquiry was not made of them. Why was inquiry not made of them? Because the Holy Spirit32 was not vested there.33 And whenever a priest does not speak with the Holy Spirit and the Divine Presence does not rest there, inquiry is not made.

How was inquiry made?34 The [High] priest would stand facing the Ark. The person making inquiry was behind him, facing the [High] Priest's back. The inquirer would ask: "Should I go up [to war] or not?" He would not ask in a loud voice, nor would he merely think about the matter in his heart. Instead, [he would speak] in a low voice, like someone praying to himself.35 Immediately, the Holy Spirit will enclothe the [High] Priest. He will look at the breastplate and with the spirit of prophecy see "Go up" or "Do not go up" written in letters emerging from the breastplate toward his face. The [High] Priest would then answer [the inquirer], telling him: "Go up" or "Do not go up."

Two matters should not be asked about at once. If they are, one replies only to the first. Inquiry should not be made [of the Urim and Tumim] by an ordinary person, only by a king, the court, or one who the community at large requires. [This is derived from Numbers 27:21:] "Before Elazar the priest shall he stand... [he and all the children of Israel with him, and the entire congregation]." "He" refers to the king;36 "all the children of Israel" to the priest anointed to lead the people in war,37 or someone whom the people need to make inquiry for them; and "all the congregation" refers to the High Court.

The statements found in the words of the prophets38 that the priests would wear an ephod of linen does not mean that they were High Priests. For the High Priest's ephod was not of linen [alone].39 For the Levites would also wear such a garment, for the prophet Samuel was a Levite, and [I Samuel 2:18] describes him as "a youth, girded with a linen ephod." Instead, this ephod was worn by the students of the prophets40 and those who were fit to have the Holy Spirit rest upon them to make it known that such a person reached a rung equivalent to that of the High Priest who speaks with the Holy Spirit via the medium of the ephod and the breastplate.

Blessed be God who grants assistance.