נְב֥וּב לֻחֹ֖ת תַּעֲשֶׂ֣ה אֹת֑וֹ כַּאֲשֶׁ֨ר הֶרְאָ֥ה אֹתְךָ֛ בָּהָ֖ר כֵּ֥ן יַעֲשֽׂוּ׃ (ס)
Ты сделаешь пустоту с досками; как было показано тебе на горе, так и сделают.
Mishnah Middot
On the floor beneath at that corner there was a place a cubit square on which was a marble slab with a ring fixed in it, and through this they used to go down to the pit to clean it out. There was an ascent on the south side of the altar, thirty-two cubits [long] by sixteen broad. It had a square window in its western side where disqualified sin-offerings of birds were placed.