On the top of the temple, spikes with sharp points were arranged to prevent birds from lighting upon it and defiling it. Twelve broad steps led down from the temple to the court of the priests.[292] These steps occupied nearly all the 22 cubits of space between the porch and the altar. Not far from the steps at the south stood the great laver, which had replaced the brazen sea of Solomon’s temple. The altar of unhewn stones rose upon the sacred rock--sacred since the days of the Jebusites (and possibly since the stone age), to which it was fitted by masonry. The base of the altar was 32 cubits square and 1 high. On this rose a structure 30 cubits square and 5 cubits high. On this was a ledge 1 cubit broad, to which the horns of the altar were attached. Not far above was another ledge, also a cubit broad, on which the officiating priests might stand. Above this was the altar hearth itself, which was 24 cubits square. South of the altar was a structure of masonry on which priests could stand; north of it, the place for the slaughter of the victims. Here the victims to be slain were tied to rings in the pavement. There were tables of marble on which they could be washed and flayed. Beams supported by pillars also contained hooks on which they could be hung for quartering. Herod, as noted above,[293] probably constructed the Low Level Aqueduct. By means of this he brought a larger supply of water into the temple area, so that there was an abundance of water with which to flush the holy place, and wash away the blood and refuse with which the place must often have reeked, especially on festal days.