Why does the Torah write "ha'Kerashim" (with a 'Hey')?
Rashi: It does so with reference to the cedars that Ya'akov Avinu planted specifically for building the Mishkan. 1
Why, in Pasuk 1, does the Torah refer to the curtains as 'Mishkan', whereas here it writes "Kerashim la'Mishkan" but does not refer to them as Mishkan?
Shabbos, 28b: To teach us that it is only a material that woven that is subject to Tum'as Ohel - as the Torah also calls the Mishkan "Ohel", 1 but not an Ohel that is made of wood. 2
In Pikudei, Sh'mos 39:32 (Oznayim la'Torah).
Oznayim la'Torah: And the reason that the Kerashim are not called 'Mishkan' is because the curtains were the real Mishkan that housed the Keilim and the boards were made exclusively to support them. Se Oznayim la'Torah who elaborates and brings proof for this explanation from Mishkan Shiloh, which the Pasuk refers to as 'Mishkan' on account of the curtains that covered it, even though it had stone walls.
What are the implications of "Atzei Shitim "Omdim"?
Rashi, Rashbam, Seforno and Targum Yonasan: It implies that the boards were arranged vertically, 1 and not horizontally, one on top of the other. 2
Hadar Zekenim #1 and Da'as Zekenim #1: It implies that they should take trees that were growing, which are strong, and not trees cut a long time ago that had rotted.
Hadar Zekenim #2 and Da'as Zekenim #2: It implies that they would last forever. 3
Yoma, 72a: It implies 'she'Ma'amidim es Tzipuyam' (meaning either that the gold with which the boards were overlaid was fixed to them with golden nails, 4 or that they neither became wormy nor did the gold plating fall off - Rashi).
Oznayim la'Torah: It implies that the boards were made to hold up the curtains which covered them. 5
Just as they grew (Targum Yonasan). The Gemara in Sukah, 45b learns from this Pasuk that every article of Mitzvah (such as the Arba Minim on Sukos) must be held the way that they grow. See Oznayim la'Torah, DH 'Omdim' #2, who explains why this principle did not apply to the Aron and the Shulchan
Like one does when building a house (Seforno).
Hadar Zekenim #2 and Da'as Zekenim #2: Indeed, they were ultimately buried, but never destroyed. See also Oznayim la'Torah DH 'Omdim' #1, who elaborates and Torah Temimh, note 17.
See Torah Temimah, mnote 16.
Refer to 26:15:2:1**.
Given the length of the boards, what was the height of the Mishkan (with reference to the building)?
Rashi: Bearing in mind that the length of the boards was synonymous with the height, 1 the height of the Mishkan was ten Amos.
QUESTIONS ON RASHI
Rashi writes that the Mishkan was ten Amos tall. Bearing in mind that the Levi'im were ten Amos tall (See Shabbos, 92a), how could the Kohanim enter the Mishkan while wearing turbans? It is not proper to serve when bent down!
Moshav Zekenim (26:1): Perhaps he was bowed. This requires investigation.
Even though Kohanim are Levi'im, perhaps the Kohanim were not 10 Amos tall, for this reason! (PF)
