Reference for Middot 3:7
פִּתְחוֹ שֶׁל אוּלָם, גָּבְהוֹ אַרְבָּעִים אַמָּה, וְרָחְבּוֹ עֶשְׂרִים אַמָּה. וְחָמֵשׁ מַלְתְּרָאוֹת שֶׁל מִילָת הָיוּ עַל גַּבָּיו. הַתַּחְתּוֹנָה עוֹדֶפֶת עַל הַפֶּתַח אַמָּה מִזֶּה וְאַמָּה מִזֶּה. שֶׁלְּמַעְלָה מִמֶּנָּה עוֹדֶפֶת עָלֶיהָ אַמָּה מִזֶּה וְאַמָּה מִזֶּה. נִמְצֵאת הָעֶלְיוֹנָה שְׁלֹשִׁים אַמָּה. וְנִדְבָּךְ שֶׁל אֲבָנִים הָיָה בֵין כָּל אַחַת וְאֶחָת:
The entrance to the Sanctuary was had a height of forty <i>amot</i>, and a width was twenty <i>amot</i>. There were five decorated beams of milas [cedar] wood on top of it [as a lintel]. The lowest [beam of the lintel] was wider [than the entrance] one <i>amah</i> on this side and one <i>amah</i> on this side. And the one above it was was wider [than the one below it] one <i>amah</i> on this side and one <i>amah</i> on this side. So, it was found that the one on top was thirty <i>amot</i> [wide]. There was a layer of stones between each beam.