משנה על נחמיה 3:8

The Hekhal was a hundred cubits by a hundred with a height of a hundred. The foundation was six cubits, then it rose forty, then a cubit for the ornamentation, two cubits for the guttering, a cubit for the ceiling and a cubit for the plastering. The height of the upper chamber was forty cubits, there was a cubit for its ornamentation, two cubits for the guttering, a cubit for the ceiling, a cubit for the plastering, three cubits for the parapet and a cubit for the spikes. Rabbi Judah says the spikes were not included in the measurement, but the parapet was four cubits.