And they dug beneath the virgin soil, and brought out from it undamaged (whole) stones, upon
Alfred Edersheim Sketches of Jewish Social Life
1. The altar was 32 by 32 [cubits]. Upwards 1 cubit, and contract 1 cubit: that was the base. Remain 30 by 30. Upwards 5, and contract 1 cubit: that was the circuit. Remain 28 by 28. The place of the horns, a cubit on this side and a cubit on that side. Remain 26 by 26. The place for the tread of the priests, a cubit on this side and a cubit on that side. Remain 24 by 24: the place where the sacrifice was laid out. Rabbi Jose said: "At the first it was only 28 by 28; though it contracted and went up, according to this measurement, until there remained the place for laying the sacrifices: 20 by 20. But when the children of the Captivity came up, they added to it 4 cubits on the south and 4 on the west like a gamma, because it is said, 'And Ariel shall be 12 cubits long by 12 broad, square.'72 That does not mean that it was only 12 by 12, since it is added: 'In the four corners thereof,' to teach that it measured from the middle 12 cubits in every direction."
And a scarlet line girdled it in the middle to separate between the upper and the lower blood-sprinklings. And the base ran round all the north and all the west side, but was shortened a cubit on the south and on the east.
2. In the south-western angle were two apertures, like small nostrils, and the blood, poured on the base to the west, and on the base to the south, descended through them, and co-mingled in the canal, and flowed out into the brook Kedron.
3. Below in the pavement, in that angle, there was a place, a cubit by a cubit, with a tablet of marble, and a ring was fastened in it, and here they went down into the sewer to cleanse it. And there was a sloping ascent to the south of the altar, 32 cubits long by 16 broad, and it had a pit at its west side, into which they put sin-offerings of birds that were defiled.
4. Both the stones of the sloping ascent and those of the altar were from the valley of Beth Cherem. And they dug beneath the virgin soil, and brought out from it undamaged (whole) stones, upon which iron had not been lifted, because iron defiles everything by contact, and by scratching. One of these stones was scratched: it was defiled; but the rest were lawful for use. And they whitened them twice in the year, once at the Passover, and once at the Feast of Tabernacles; and the Sanctuary once at the Passover. Rabbi73 says: "On the eve of every Sabbath they whitened it with a cloth, on account of the blood-sprinklings." They did not plaster it with an iron trowel, lest it might touch, and defile. For the iron is created to shorten the days of man, and the altar is created to lengthen the days of man, therefore it is not right that that which shortens should be lifted upon that which lengthens.
5. And rings were to the north of the altar: six rows, each of four; but some say, four rows, each of six; and in these they slaughtered the holy sacrifices. The house (place) of slaughtering was to the north of the altar. And there were eight short pillars and squares of cedar upon the top of them, and hooks of iron were fastened in them, and three rows were upon each of them, upon which they hung up, and they skinned upon marble tables which were between the pillars.
72 Ezekiel 43:16, "Ariel" = the lion of God = the altar. 73 The Rabbi, i.e. R. Jehudah the Holy.