Mishnà su Ezechiele 41:2

Rabbi Shimon said: if three have eaten at one table and have not spoken there words of Torah, [it is] as if they had eaten sacrifices [offered] to the dead, as it is said, “for all tables are full of filthy vomit, when the All-Present is absent” (Isaiah 28:8). But, if three have eaten at one table, and have spoken there words of Torah, [it is] as if they had eaten at the table of the All-Present, blessed be He, as it is said, “And He said unto me, ‘this is the table before the Lord’” (Ezekiel 41:22).

The doorway of the Hekhal was twenty cubits high and ten broad. It had four doors, two on the inner side, and two on the outer, as it says, “And the Hekhal and the Sanctuary had two doors” (Ezekiel 41:23). The outer ones opened into the interior of the doorway so as to cover the thickness of the wall, while the inner ones opened into the Temple so as to cover the space behind the doors, because the whole of the Temple was overlaid with gold except the space behind the doors. Rabbi Judah says: they stood within the doorway, and they resembled folding doors. These were two cubits and a half [of the wall] and these were two cubits and a half, leaving half a cubit as a doorpost at the one end and half a cubit as a doorpost at the other end, as it says, “And the doors had two leaves apiece, two turning leaves, two leaves for the one door and two leaves for the other” (Ezekiel 41:24).