וְאֵת֙ פֶּ֣תַח הַדְּבִ֔יר עָשָׂ֖ה דַּלְת֣וֹת עֲצֵי־שָׁ֑מֶן הָאַ֥יִל מְזוּז֖וֹת חֲמִשִֽׁית׃
Zum Eingang des Allerheiligsten machte er Türen von Oleasterholz, die Oberschwelle und die Pfosten fünfseitig.
Rashi
The lintel. These are the lintels [=אילי] of the entrance, these are the doorposts from each side that were made round, similar to אילים,39Yechezkeil 40:21. איליו,40Ibid. 40:9. ואילמיו41Ibid. 40:10. (other texts: אלה' ואלון), and similarly in all of Yechezkeil’s structure[s],42See Ibid. 40. the doorposts at the entrance are called אילים.43See Rashi Ibid. 40:9.
Rashi
The door-posts. [The door frame consisted of five parts.] The threshold is one, and the side posts on each side are two, totaling three, and the lintel which is on it was made in two, like this. Thus have I heard.44Alternatively, it was the fifth of a series of doorways of the Beis Hamikdosh encountered by one entering from the outside.—Ralbag. But I say, מזוזות חמישית [refers to the] five sides that each of the door posts had, and it was not four-sided; and [the verse] is speaking neither about the threshold nor about the lintel, because we find neither the threshold nor the lintel called “אילים.”