Mishnà su Isaia 29:78

From east to west was a hundred cubits: The wall of the porch five cubits, the porch itself eleven, the wall of the Hekhal six cubits and its interior forty, a cubit for the space between, and twenty cubits for the Holy of Holies, the wall of the Hekhal six cubits, the cell six cubits and the wall of the cell five. From north to south was seventy cubits: The wall of the mesibbah five cubits, the mesibbah itself three, the wall of the cell five and the cell itself six, the wall of the Hekhal six cubits and its interior twenty, then the wall of the Hekhal again six and the cell six and its wall five, then the place of the water descent three cubits and its wall five cubits. The Porch extended beyond this fifteen cubits on the north and fifteen cubits on the south, and this space was called the House of the slaughter-knives where they used to store the knives. The Hekhal was narrow behind and broad in front, resembling a lion, as it says, "Ah, Ariel, Ariel, the city where David encamped" (Isaiah 29:1): Just as a lion is narrow behind and broad in front, so the Hekhal was narrow behind and broad in front.