Leviticus 16:2-4

2and the Lord said to Moses: “Tell Aaron your brother that he must not enter at any time into the holy place inside the veil-canopy
Heb “into the holy place from house to the veil-canopy.” In this instance, the Hebrew term “the holy place” refers to “the most holy place” (lit. “holy of holies”), since it is the area “inside the veil-canopy” (cf. Exod 26:33–34). The Hebrew term פָּרֹכֶת (parokhet) is usually translated “veil” or “curtain,” but it seems to have stretched not only in front of but also over the top of the ark of the covenant which stood behind and under it inside the most holy place, and thus formed more of a canopy than simply a curtain (see R. E. Averbeck, NIDOTTE 3:687–89).
in front of the atonement plate
Heb “to the faces of the atonement plate.” The exact meaning of the Hebrew term כַּפֹּרֶת (kapporet) here rendered “atonement plate” is much debated. The traditional “mercy seat” (KJV, ASV, NASB, NRSV) does not suit the cognate relationship between this term and the Piel verb כִּפֶּר (kipper, “to make atonement, to make expiation”). The translation of the word should also reflect the fact that the most important atonement procedures on the Day of Atonement were performed in relation to it. Since the Lord would “appear in the cloud over the atonement plate,” and since it was so closely associated with the ark of the covenant (the ark being his “footstool”; cf. 1 Chr 28:2 and Ps 132:7–8), one could take it to be the place of his throne at which he accepts atonement. See J. Milgrom, Leviticus (AB), 1:1014; J. E. Hartley, Leviticus (WBC), 234-35; and R. E. Averbeck, NIDOTTE 2:691, 699. Cf. NIV “the atonement cover”; NCV “the lid on the Ark”; NLT “the Ark’s cover – the place of atonement.”
that is on the ark so that he may not die, for I will appear in the cloud over the atonement plate.

Day of Atonement Offerings

3 “In this way Aaron is to enter into the sanctuary – with a young bull
Heb “with a bull, a son of the herd.”
for a sin offering
See the note on Lev 4:3 regarding the term “sin offering.”
and a ram for a burnt offering.
For the “burnt offering” see the note on Lev 1:3.
4He must put on a holy linen tunic,
The term “tunic” refers to a shirt-like garment worn next to the skin and, therefore, put on first (cf. Exod 28:4, 39–40; 29:5, 8; 39:27). It covered the upper body only. For detailed remarks on the terminology for the priestly clothing in this verse (except the “linen leggings”) see the notes on Lev 8:7–9 and the literature cited there.
linen leggings are to cover his body,
Heb “shall be on his flesh.” As in many instances in Lev 15, the term “flesh” or “body” here is euphemistic for the male genitals (J. Milgrom, Leviticus [AB], 1:1017, and J. E. Hartley, Leviticus [WBC], 222; cf. the note on Lev 15:2), which the priest must be careful not to expose during such ritual procedures (see Exod 20:26 with 28:42–43).
and he is to wrap himself with a linen sash
The sash fastened the tunic around the waist (Exod 28:4, 39; 29:9; 39:29).
and wrap his head with a linen turban.
Heb “and in a turban of linen he shall wrap.”
The turban consisted of wound up linen (cf. Exod 28:4, 37, 39; 29:6; 39:31; Lev 16:4). It is usually thought to be a “turban,” but it might be only a “turban-like headband” wound around the forehead area (HALOT 624 s.v. מִצְנֶפֶת).
They are holy garments, so he must bathe
Heb “and he shall bathe….”
his body in water and put them on.
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